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[v5] plumbing: format/idxfile, Fix version and fanout checks#1937

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pjbgf merged 1 commit intogo-git:releases/v5.xfrom
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Mar 28, 2026
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[v5] plumbing: format/idxfile, Fix version and fanout checks#1937
pjbgf merged 1 commit intogo-git:releases/v5.xfrom
pjbgf:idx-v5

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@pjbgf pjbgf commented Mar 28, 2026

Tightens idxfile decoding validation by enforcing strict version matching and detecting corrupted fanout tables.

Backport of #1936.

Signed-off-by: Paulo Gomes <paulo@entire.io>
Copilot AI review requested due to automatic review settings March 28, 2026 13:58
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Pull request overview

Backport that tightens IDX (pack index) decoding validation by enforcing strict version matching and detecting corrupted fanout tables during decode.

Changes:

  • Enforce exact IDX version match (v2 only) and include the encountered version in the returned error.
  • Validate that the 256-entry fanout table is monotonically non-decreasing, returning a malformed-index error on corruption.
  • Expand decoder error-path tests to cover version, truncated data, fanout corruption, and checksum mismatch cases.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File Description
plumbing/format/idxfile/decoder.go Tightens version validation and adds fanout monotonicity checks during decode.
plumbing/format/idxfile/decoder_test.go Reworks checksum mismatch test into a broader table-driven suite covering additional decode error scenarios.

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Comment thread plumbing/format/idxfile/decoder_test.go
Comment thread plumbing/format/idxfile/decoder.go
@pjbgf pjbgf merged commit 5e23dfd into go-git:releases/v5.x Mar 28, 2026
16 checks passed
@pjbgf pjbgf deleted the idx-v5 branch March 28, 2026 14:26
nschloe pushed a commit to live-clones/forgejo that referenced this pull request Mar 31, 2026
…0/forgejo) (#11898)

This PR contains the following updates:

| Package | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
| [github.com/go-git/go-git/v5](https://github.com/go-git/go-git) | `v5.16.5` → `v5.17.1` | ![age](https://developer.mend.io/api/mc/badges/age/go/github.com%2fgo-git%2fgo-git%2fv5/v5.17.1?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/go/github.com%2fgo-git%2fgo-git%2fv5/v5.16.5/v5.17.1?slim=true) |

---

> ⚠️ **Warning**
>
> Some dependencies could not be looked up. Check the [Dependency Dashboard](issues/2779) for more information.

---

### go-git missing validation decoding Index v4 files leads to panic
[CVE-2026-33762](https://nvd.nist.gov/vuln/detail/CVE-2026-33762) / [GHSA-gm2x-2g9h-ccm8](GHSA-gm2x-2g9h-ccm8)

<details>
<summary>More information</summary>

#### Details
##### Impact

`go-git`’s index decoder for format version 4 fails to validate the path name prefix length before applying it to the previously decoded path name. A maliciously crafted index file can trigger an out-of-bounds slice operation, resulting in a runtime panic during normal index parsing.

This issue only affects Git index format version 4. Earlier formats (`go-git` supports only `v2` and `v3`) are not vulnerable to this issue.

An attacker able to supply a crafted `.git/index` file can cause applications using go-git to panic while reading the index. If the application does not recover from panics, this results in process termination, leading to a denial-of-service (DoS) condition.

Exploitation requires the ability to modify or inject a Git index file within the local repository in disk. This typically implies write access to the `.git` directory.

##### Patches

Users should upgrade to `v5.17.1`, or the latest `v6` [pseudo-version](https://go.dev/ref/mod#pseudo-versions), in order to mitigate this vulnerability.

##### Credit

go-git maintainers thank @&#8203;kq5y for finding and reporting this issue privately to the `go-git` project.

#### Severity
- CVSS Score: 2.8 / 10 (Low)
- Vector String: `CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L`

#### References
- [https://github.com/go-git/go-git/security/advisories/GHSA-gm2x-2g9h-ccm8](https://github.com/go-git/go-git/security/advisories/GHSA-gm2x-2g9h-ccm8)
- [https://github.com/go-git/go-git](https://github.com/go-git/go-git)

This data is provided by [OSV](https://osv.dev/vulnerability/GHSA-gm2x-2g9h-ccm8) and the [GitHub Advisory Database](https://github.com/github/advisory-database) ([CC-BY 4.0](https://github.com/github/advisory-database/blob/main/LICENSE.md)).
</details>

---

### go-git: Maliciously crafted idx file can cause asymmetric memory consumption
[CVE-2026-34165](https://nvd.nist.gov/vuln/detail/CVE-2026-34165) / [GHSA-jhf3-xxhw-2wpp](GHSA-jhf3-xxhw-2wpp)

<details>
<summary>More information</summary>

#### Details
##### Impact

A vulnerability has been identified in which a maliciously crafted `.idx` file can cause asymmetric memory consumption, potentially exhausting available memory and resulting in a Denial of Service (DoS) condition.

Exploitation requires write access to the local repository's `.git` directory, it order to create or alter existing `.idx` files.

##### Patches

Users should upgrade to `v5.17.1`, or the latest `v6` [pseudo-version](https://go.dev/ref/mod#pseudo-versions), in order to mitigate this vulnerability.

##### Credit

The go-git maintainers thank @&#8203;kq5y for finding and reporting this issue privately to the `go-git` project.

#### Severity
- CVSS Score: 5.0 / 10 (Medium)
- Vector String: `CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H`

#### References
- [https://github.com/go-git/go-git/security/advisories/GHSA-jhf3-xxhw-2wpp](https://github.com/go-git/go-git/security/advisories/GHSA-jhf3-xxhw-2wpp)
- [https://github.com/go-git/go-git](https://github.com/go-git/go-git)
- [https://github.com/go-git/go-git/releases/tag/v5.17.1](https://github.com/go-git/go-git/releases/tag/v5.17.1)

This data is provided by [OSV](https://osv.dev/vulnerability/GHSA-jhf3-xxhw-2wpp) and the [GitHub Advisory Database](https://github.com/github/advisory-database) ([CC-BY 4.0](https://github.com/github/advisory-database/blob/main/LICENSE.md)).
</details>

---

### Release Notes

<details>
<summary>go-git/go-git (github.com/go-git/go-git/v5)</summary>

### [`v5.17.1`](https://github.com/go-git/go-git/releases/tag/v5.17.1)

[Compare Source](go-git/go-git@v5.17.0...v5.17.1)

#### What's Changed

- build: Update module github.com/cloudflare/circl to v1.6.3 \[SECURITY] (releases/v5.x) by [@&#8203;go-git-renovate](https://github.com/go-git-renovate)\[bot] in [#&#8203;1930](go-git/go-git#1930)
- \[v5] plumbing: format/index, Improve v4 entry name validation by [@&#8203;pjbgf](https://github.com/pjbgf) in [#&#8203;1935](go-git/go-git#1935)
- \[v5] plumbing: format/idxfile, Fix version and fanout checks by [@&#8203;pjbgf](https://github.com/pjbgf) in [#&#8203;1937](go-git/go-git#1937)

**Full Changelog**: <go-git/go-git@v5.17.0...v5.17.1>

### [`v5.17.0`](https://github.com/go-git/go-git/releases/tag/v5.17.0)

[Compare Source](go-git/go-git@v5.16.5...v5.17.0)

#### What's Changed

- build: Update module github.com/go-git/go-git/v5 to v5.16.5 \[SECURITY] (releases/v5.x) by [@&#8203;go-git-renovate](https://github.com/go-git-renovate)\[bot] in [#&#8203;1839](go-git/go-git#1839)
- git: worktree, optimize infiles function for very large repos by [@&#8203;k-anshul](https://github.com/k-anshul) in [#&#8203;1853](go-git/go-git#1853)
- git: Add strict checks for supported extensions by [@&#8203;pjbgf](https://github.com/pjbgf) in [#&#8203;1861](go-git/go-git#1861)
- backport, git: Improve Status() speed with new index.ModTime check by [@&#8203;cedric-appdirect](https://github.com/cedric-appdirect) in [#&#8203;1862](go-git/go-git#1862)
- storage: filesystem, Avoid overwriting loose obj files by [@&#8203;pjbgf](https://github.com/pjbgf) in [#&#8203;1864](go-git/go-git#1864)

**Full Changelog**: <go-git/go-git@v5.16.5...v5.17.0>

</details>

---

### Configuration

📅 **Schedule**: Branch creation - "" (UTC), Automerge - Between 12:00 AM and 03:59 AM ( * 0-3 * * * ) (UTC).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0My45OS4xIiwidXBkYXRlZEluVmVyIjoiNDMuOTkuMSIsInRhcmdldEJyYW5jaCI6InYxMS4wL2Zvcmdlam8iLCJsYWJlbHMiOlsiZGVwZW5kZW5jeS11cGdyYWRlIiwidGVzdC9ub3QtbmVlZGVkIl19-->

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/11898
Reviewed-by: Mathieu Fenniak <mfenniak@noreply.codeberg.org>
Co-authored-by: Renovate Bot <bot@kriese.eu>
Co-committed-by: Renovate Bot <bot@kriese.eu>
nschloe pushed a commit to live-clones/forgejo that referenced this pull request Mar 31, 2026
…v15.0/forgejo) (#11900)

This PR contains the following updates:

| Package | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
| [github.com/go-git/go-git/v5](https://github.com/go-git/go-git) | `v5.17.0` → `v5.17.1` | ![age](https://developer.mend.io/api/mc/badges/age/go/github.com%2fgo-git%2fgo-git%2fv5/v5.17.1?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/go/github.com%2fgo-git%2fgo-git%2fv5/v5.17.0/v5.17.1?slim=true) |

---

### go-git missing validation decoding Index v4 files leads to panic
[CVE-2026-33762](https://nvd.nist.gov/vuln/detail/CVE-2026-33762) / [GHSA-gm2x-2g9h-ccm8](GHSA-gm2x-2g9h-ccm8)

<details>
<summary>More information</summary>

#### Details
##### Impact

`go-git`’s index decoder for format version 4 fails to validate the path name prefix length before applying it to the previously decoded path name. A maliciously crafted index file can trigger an out-of-bounds slice operation, resulting in a runtime panic during normal index parsing.

This issue only affects Git index format version 4. Earlier formats (`go-git` supports only `v2` and `v3`) are not vulnerable to this issue.

An attacker able to supply a crafted `.git/index` file can cause applications using go-git to panic while reading the index. If the application does not recover from panics, this results in process termination, leading to a denial-of-service (DoS) condition.

Exploitation requires the ability to modify or inject a Git index file within the local repository in disk. This typically implies write access to the `.git` directory.

##### Patches

Users should upgrade to `v5.17.1`, or the latest `v6` [pseudo-version](https://go.dev/ref/mod#pseudo-versions), in order to mitigate this vulnerability.

##### Credit

go-git maintainers thank @&#8203;kq5y for finding and reporting this issue privately to the `go-git` project.

#### Severity
- CVSS Score: 2.8 / 10 (Low)
- Vector String: `CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L`

#### References
- [https://github.com/go-git/go-git/security/advisories/GHSA-gm2x-2g9h-ccm8](https://github.com/go-git/go-git/security/advisories/GHSA-gm2x-2g9h-ccm8)
- [https://github.com/go-git/go-git](https://github.com/go-git/go-git)

This data is provided by [OSV](https://osv.dev/vulnerability/GHSA-gm2x-2g9h-ccm8) and the [GitHub Advisory Database](https://github.com/github/advisory-database) ([CC-BY 4.0](https://github.com/github/advisory-database/blob/main/LICENSE.md)).
</details>

---

### go-git: Maliciously crafted idx file can cause asymmetric memory consumption
[CVE-2026-34165](https://nvd.nist.gov/vuln/detail/CVE-2026-34165) / [GHSA-jhf3-xxhw-2wpp](GHSA-jhf3-xxhw-2wpp)

<details>
<summary>More information</summary>

#### Details
##### Impact

A vulnerability has been identified in which a maliciously crafted `.idx` file can cause asymmetric memory consumption, potentially exhausting available memory and resulting in a Denial of Service (DoS) condition.

Exploitation requires write access to the local repository's `.git` directory, it order to create or alter existing `.idx` files.

##### Patches

Users should upgrade to `v5.17.1`, or the latest `v6` [pseudo-version](https://go.dev/ref/mod#pseudo-versions), in order to mitigate this vulnerability.

##### Credit

The go-git maintainers thank @&#8203;kq5y for finding and reporting this issue privately to the `go-git` project.

#### Severity
- CVSS Score: 5.0 / 10 (Medium)
- Vector String: `CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H`

#### References
- [https://github.com/go-git/go-git/security/advisories/GHSA-jhf3-xxhw-2wpp](https://github.com/go-git/go-git/security/advisories/GHSA-jhf3-xxhw-2wpp)
- [https://github.com/go-git/go-git](https://github.com/go-git/go-git)
- [https://github.com/go-git/go-git/releases/tag/v5.17.1](https://github.com/go-git/go-git/releases/tag/v5.17.1)

This data is provided by [OSV](https://osv.dev/vulnerability/GHSA-jhf3-xxhw-2wpp) and the [GitHub Advisory Database](https://github.com/github/advisory-database) ([CC-BY 4.0](https://github.com/github/advisory-database/blob/main/LICENSE.md)).
</details>

---

### Release Notes

<details>
<summary>go-git/go-git (github.com/go-git/go-git/v5)</summary>

### [`v5.17.1`](https://github.com/go-git/go-git/releases/tag/v5.17.1)

[Compare Source](go-git/go-git@v5.17.0...v5.17.1)

#### What's Changed

- build: Update module github.com/cloudflare/circl to v1.6.3 \[SECURITY] (releases/v5.x) by [@&#8203;go-git-renovate](https://github.com/go-git-renovate)\[bot] in [#&#8203;1930](go-git/go-git#1930)
- \[v5] plumbing: format/index, Improve v4 entry name validation by [@&#8203;pjbgf](https://github.com/pjbgf) in [#&#8203;1935](go-git/go-git#1935)
- \[v5] plumbing: format/idxfile, Fix version and fanout checks by [@&#8203;pjbgf](https://github.com/pjbgf) in [#&#8203;1937](go-git/go-git#1937)

**Full Changelog**: <go-git/go-git@v5.17.0...v5.17.1>

</details>

---

### Configuration

📅 **Schedule**: Branch creation - "" (UTC), Automerge - Between 12:00 AM and 03:59 AM ( * 0-3 * * * ) (UTC).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0My45OS4xIiwidXBkYXRlZEluVmVyIjoiNDMuOTkuMSIsInRhcmdldEJyYW5jaCI6InYxNS4wL2Zvcmdlam8iLCJsYWJlbHMiOlsiZGVwZW5kZW5jeS11cGdyYWRlIiwidGVzdC9ub3QtbmVlZGVkIl19-->

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/11900
Reviewed-by: Mathieu Fenniak <mfenniak@noreply.codeberg.org>
Co-authored-by: Renovate Bot <bot@kriese.eu>
Co-committed-by: Renovate Bot <bot@kriese.eu>
nschloe pushed a commit to live-clones/forgejo that referenced this pull request Mar 31, 2026
…forgejo) (#11897)

This PR contains the following updates:

| Package | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
| [github.com/go-git/go-git/v5](https://github.com/go-git/go-git) | `v5.17.0` → `v5.17.1` | ![age](https://developer.mend.io/api/mc/badges/age/go/github.com%2fgo-git%2fgo-git%2fv5/v5.17.1?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/go/github.com%2fgo-git%2fgo-git%2fv5/v5.17.0/v5.17.1?slim=true) |

---

### go-git missing validation decoding Index v4 files leads to panic
[CVE-2026-33762](https://nvd.nist.gov/vuln/detail/CVE-2026-33762) / [GHSA-gm2x-2g9h-ccm8](GHSA-gm2x-2g9h-ccm8)

<details>
<summary>More information</summary>

#### Details
##### Impact

`go-git`’s index decoder for format version 4 fails to validate the path name prefix length before applying it to the previously decoded path name. A maliciously crafted index file can trigger an out-of-bounds slice operation, resulting in a runtime panic during normal index parsing.

This issue only affects Git index format version 4. Earlier formats (`go-git` supports only `v2` and `v3`) are not vulnerable to this issue.

An attacker able to supply a crafted `.git/index` file can cause applications using go-git to panic while reading the index. If the application does not recover from panics, this results in process termination, leading to a denial-of-service (DoS) condition.

Exploitation requires the ability to modify or inject a Git index file within the local repository in disk. This typically implies write access to the `.git` directory.

##### Patches

Users should upgrade to `v5.17.1`, or the latest `v6` [pseudo-version](https://go.dev/ref/mod#pseudo-versions), in order to mitigate this vulnerability.

##### Credit

go-git maintainers thank @&#8203;kq5y for finding and reporting this issue privately to the `go-git` project.

#### Severity
- CVSS Score: 2.8 / 10 (Low)
- Vector String: `CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L`

#### References
- [https://github.com/go-git/go-git/security/advisories/GHSA-gm2x-2g9h-ccm8](https://github.com/go-git/go-git/security/advisories/GHSA-gm2x-2g9h-ccm8)
- [https://github.com/go-git/go-git](https://github.com/go-git/go-git)

This data is provided by [OSV](https://osv.dev/vulnerability/GHSA-gm2x-2g9h-ccm8) and the [GitHub Advisory Database](https://github.com/github/advisory-database) ([CC-BY 4.0](https://github.com/github/advisory-database/blob/main/LICENSE.md)).
</details>

---

### go-git: Maliciously crafted idx file can cause asymmetric memory consumption
[CVE-2026-34165](https://nvd.nist.gov/vuln/detail/CVE-2026-34165) / [GHSA-jhf3-xxhw-2wpp](GHSA-jhf3-xxhw-2wpp)

<details>
<summary>More information</summary>

#### Details
##### Impact

A vulnerability has been identified in which a maliciously crafted `.idx` file can cause asymmetric memory consumption, potentially exhausting available memory and resulting in a Denial of Service (DoS) condition.

Exploitation requires write access to the local repository's `.git` directory, it order to create or alter existing `.idx` files.

##### Patches

Users should upgrade to `v5.17.1`, or the latest `v6` [pseudo-version](https://go.dev/ref/mod#pseudo-versions), in order to mitigate this vulnerability.

##### Credit

The go-git maintainers thank @&#8203;kq5y for finding and reporting this issue privately to the `go-git` project.

#### Severity
- CVSS Score: 5.0 / 10 (Medium)
- Vector String: `CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H`

#### References
- [https://github.com/go-git/go-git/security/advisories/GHSA-jhf3-xxhw-2wpp](https://github.com/go-git/go-git/security/advisories/GHSA-jhf3-xxhw-2wpp)
- [https://github.com/go-git/go-git](https://github.com/go-git/go-git)
- [https://github.com/go-git/go-git/releases/tag/v5.17.1](https://github.com/go-git/go-git/releases/tag/v5.17.1)

This data is provided by [OSV](https://osv.dev/vulnerability/GHSA-jhf3-xxhw-2wpp) and the [GitHub Advisory Database](https://github.com/github/advisory-database) ([CC-BY 4.0](https://github.com/github/advisory-database/blob/main/LICENSE.md)).
</details>

---

### Release Notes

<details>
<summary>go-git/go-git (github.com/go-git/go-git/v5)</summary>

### [`v5.17.1`](https://github.com/go-git/go-git/releases/tag/v5.17.1)

[Compare Source](go-git/go-git@v5.17.0...v5.17.1)

#### What's Changed

- build: Update module github.com/cloudflare/circl to v1.6.3 \[SECURITY] (releases/v5.x) by [@&#8203;go-git-renovate](https://github.com/go-git-renovate)\[bot] in [#&#8203;1930](go-git/go-git#1930)
- \[v5] plumbing: format/index, Improve v4 entry name validation by [@&#8203;pjbgf](https://github.com/pjbgf) in [#&#8203;1935](go-git/go-git#1935)
- \[v5] plumbing: format/idxfile, Fix version and fanout checks by [@&#8203;pjbgf](https://github.com/pjbgf) in [#&#8203;1937](go-git/go-git#1937)

**Full Changelog**: <go-git/go-git@v5.17.0...v5.17.1>

</details>

---

### Configuration

📅 **Schedule**: Branch creation - "" (UTC), Automerge - Between 12:00 AM and 03:59 AM ( * 0-3 * * * ) (UTC).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0My45OS4xIiwidXBkYXRlZEluVmVyIjoiNDMuOTkuMSIsInRhcmdldEJyYW5jaCI6ImZvcmdlam8iLCJsYWJlbHMiOlsiZGVwZW5kZW5jeS11cGdyYWRlIiwidGVzdC9ub3QtbmVlZGVkIl19-->

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/11897
Reviewed-by: Mathieu Fenniak <mfenniak@noreply.codeberg.org>
Co-authored-by: Renovate Bot <bot@kriese.eu>
Co-committed-by: Renovate Bot <bot@kriese.eu>
nschloe pushed a commit to live-clones/forgejo that referenced this pull request Mar 31, 2026
…v14.0/forgejo) (#11899)

This PR contains the following updates:

| Package | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
| [github.com/go-git/go-git/v5](https://github.com/go-git/go-git) | `v5.16.5` → `v5.17.1` | ![age](https://developer.mend.io/api/mc/badges/age/go/github.com%2fgo-git%2fgo-git%2fv5/v5.17.1?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/go/github.com%2fgo-git%2fgo-git%2fv5/v5.16.5/v5.17.1?slim=true) |

---

### go-git missing validation decoding Index v4 files leads to panic
[CVE-2026-33762](https://nvd.nist.gov/vuln/detail/CVE-2026-33762) / [GHSA-gm2x-2g9h-ccm8](GHSA-gm2x-2g9h-ccm8)

<details>
<summary>More information</summary>

#### Details
##### Impact

`go-git`’s index decoder for format version 4 fails to validate the path name prefix length before applying it to the previously decoded path name. A maliciously crafted index file can trigger an out-of-bounds slice operation, resulting in a runtime panic during normal index parsing.

This issue only affects Git index format version 4. Earlier formats (`go-git` supports only `v2` and `v3`) are not vulnerable to this issue.

An attacker able to supply a crafted `.git/index` file can cause applications using go-git to panic while reading the index. If the application does not recover from panics, this results in process termination, leading to a denial-of-service (DoS) condition.

Exploitation requires the ability to modify or inject a Git index file within the local repository in disk. This typically implies write access to the `.git` directory.

##### Patches

Users should upgrade to `v5.17.1`, or the latest `v6` [pseudo-version](https://go.dev/ref/mod#pseudo-versions), in order to mitigate this vulnerability.

##### Credit

go-git maintainers thank @&#8203;kq5y for finding and reporting this issue privately to the `go-git` project.

#### Severity
- CVSS Score: 2.8 / 10 (Low)
- Vector String: `CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L`

#### References
- [https://github.com/go-git/go-git/security/advisories/GHSA-gm2x-2g9h-ccm8](https://github.com/go-git/go-git/security/advisories/GHSA-gm2x-2g9h-ccm8)
- [https://github.com/go-git/go-git](https://github.com/go-git/go-git)

This data is provided by [OSV](https://osv.dev/vulnerability/GHSA-gm2x-2g9h-ccm8) and the [GitHub Advisory Database](https://github.com/github/advisory-database) ([CC-BY 4.0](https://github.com/github/advisory-database/blob/main/LICENSE.md)).
</details>

---

### go-git: Maliciously crafted idx file can cause asymmetric memory consumption
[CVE-2026-34165](https://nvd.nist.gov/vuln/detail/CVE-2026-34165) / [GHSA-jhf3-xxhw-2wpp](GHSA-jhf3-xxhw-2wpp)

<details>
<summary>More information</summary>

#### Details
##### Impact

A vulnerability has been identified in which a maliciously crafted `.idx` file can cause asymmetric memory consumption, potentially exhausting available memory and resulting in a Denial of Service (DoS) condition.

Exploitation requires write access to the local repository's `.git` directory, it order to create or alter existing `.idx` files.

##### Patches

Users should upgrade to `v5.17.1`, or the latest `v6` [pseudo-version](https://go.dev/ref/mod#pseudo-versions), in order to mitigate this vulnerability.

##### Credit

The go-git maintainers thank @&#8203;kq5y for finding and reporting this issue privately to the `go-git` project.

#### Severity
- CVSS Score: 5.0 / 10 (Medium)
- Vector String: `CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H`

#### References
- [https://github.com/go-git/go-git/security/advisories/GHSA-jhf3-xxhw-2wpp](https://github.com/go-git/go-git/security/advisories/GHSA-jhf3-xxhw-2wpp)
- [https://github.com/go-git/go-git](https://github.com/go-git/go-git)
- [https://github.com/go-git/go-git/releases/tag/v5.17.1](https://github.com/go-git/go-git/releases/tag/v5.17.1)

This data is provided by [OSV](https://osv.dev/vulnerability/GHSA-jhf3-xxhw-2wpp) and the [GitHub Advisory Database](https://github.com/github/advisory-database) ([CC-BY 4.0](https://github.com/github/advisory-database/blob/main/LICENSE.md)).
</details>

---

### Release Notes

<details>
<summary>go-git/go-git (github.com/go-git/go-git/v5)</summary>

### [`v5.17.1`](https://github.com/go-git/go-git/releases/tag/v5.17.1)

[Compare Source](go-git/go-git@v5.17.0...v5.17.1)

#### What's Changed

- build: Update module github.com/cloudflare/circl to v1.6.3 \[SECURITY] (releases/v5.x) by [@&#8203;go-git-renovate](https://github.com/go-git-renovate)\[bot] in [#&#8203;1930](go-git/go-git#1930)
- \[v5] plumbing: format/index, Improve v4 entry name validation by [@&#8203;pjbgf](https://github.com/pjbgf) in [#&#8203;1935](go-git/go-git#1935)
- \[v5] plumbing: format/idxfile, Fix version and fanout checks by [@&#8203;pjbgf](https://github.com/pjbgf) in [#&#8203;1937](go-git/go-git#1937)

**Full Changelog**: <go-git/go-git@v5.17.0...v5.17.1>

### [`v5.17.0`](https://github.com/go-git/go-git/releases/tag/v5.17.0)

[Compare Source](go-git/go-git@v5.16.5...v5.17.0)

#### What's Changed

- build: Update module github.com/go-git/go-git/v5 to v5.16.5 \[SECURITY] (releases/v5.x) by [@&#8203;go-git-renovate](https://github.com/go-git-renovate)\[bot] in [#&#8203;1839](go-git/go-git#1839)
- git: worktree, optimize infiles function for very large repos by [@&#8203;k-anshul](https://github.com/k-anshul) in [#&#8203;1853](go-git/go-git#1853)
- git: Add strict checks for supported extensions by [@&#8203;pjbgf](https://github.com/pjbgf) in [#&#8203;1861](go-git/go-git#1861)
- backport, git: Improve Status() speed with new index.ModTime check by [@&#8203;cedric-appdirect](https://github.com/cedric-appdirect) in [#&#8203;1862](go-git/go-git#1862)
- storage: filesystem, Avoid overwriting loose obj files by [@&#8203;pjbgf](https://github.com/pjbgf) in [#&#8203;1864](go-git/go-git#1864)

**Full Changelog**: <go-git/go-git@v5.16.5...v5.17.0>

</details>

---

### Configuration

📅 **Schedule**: Branch creation - "" (UTC), Automerge - Between 12:00 AM and 03:59 AM ( * 0-3 * * * ) (UTC).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0My45OS4xIiwidXBkYXRlZEluVmVyIjoiNDMuOTkuMSIsInRhcmdldEJyYW5jaCI6InYxNC4wL2Zvcmdlam8iLCJsYWJlbHMiOlsiZGVwZW5kZW5jeS11cGdyYWRlIiwidGVzdC9ub3QtbmVlZGVkIl19-->

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/11899
Reviewed-by: Mathieu Fenniak <mfenniak@noreply.codeberg.org>
Co-authored-by: Renovate Bot <bot@kriese.eu>
Co-committed-by: Renovate Bot <bot@kriese.eu>
Maks1mS pushed a commit to stplr-dev/stplr that referenced this pull request Mar 31, 2026
This PR contains the following updates:

| Package | Type | Update | Change | OpenSSF |
|---|---|---|---|---|
| [github.com/go-git/go-git/v5](https://github.com/go-git/go-git) | require | patch | `v5.17.0` → `v5.17.1` | [![OpenSSF Scorecard](https://api.securityscorecards.dev/projects/github.com/go-git/go-git/badge)](https://securityscorecards.dev/viewer/?uri=github.com/go-git/go-git) |

---

> ⚠️ **Warning**
>
> Some dependencies could not be looked up. Check the [Dependency Dashboard](issues/23) for more information.

---

### Release Notes

<details>
<summary>go-git/go-git (github.com/go-git/go-git/v5)</summary>

### [`v5.17.1`](https://github.com/go-git/go-git/releases/tag/v5.17.1)

[Compare Source](go-git/go-git@v5.17.0...v5.17.1)

#### What's Changed

- build: Update module github.com/cloudflare/circl to v1.6.3 \[SECURITY] (releases/v5.x) by [@&#8203;go-git-renovate](https://github.com/go-git-renovate)\[bot] in [#&#8203;1930](go-git/go-git#1930)
- \[v5] plumbing: format/index, Improve v4 entry name validation by [@&#8203;pjbgf](https://github.com/pjbgf) in [#&#8203;1935](go-git/go-git#1935)
- \[v5] plumbing: format/idxfile, Fix version and fanout checks by [@&#8203;pjbgf](https://github.com/pjbgf) in [#&#8203;1937](go-git/go-git#1937)

**Full Changelog**: <go-git/go-git@v5.17.0...v5.17.1>

</details>

---

### Configuration

📅 **Schedule**: Branch creation - At 12:00 AM through 04:59 AM and 10:00 PM through 11:59 PM, Monday through Friday ( * 0-4,22-23 * * 1-5 ), Only on Sunday and Saturday ( * * * * 0,6 ) (UTC), Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0My44Ni4xIiwidXBkYXRlZEluVmVyIjoiNDMuODYuMSIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOlsiS2luZC9EZXBlbmRlbmNpZXMiXX0=-->

Reviewed-on: https://altlinux.space/stapler/stplr/pulls/383
Co-authored-by: Renovate Bot <stapler-helper-bot@noreply.altlinux.space>
Co-committed-by: Renovate Bot <stapler-helper-bot@noreply.altlinux.space>
GreemDev pushed a commit to Ryubing/forgejo that referenced this pull request Apr 3, 2026
…forgejo) (#11897)

This PR contains the following updates:

| Package | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
| [github.com/go-git/go-git/v5](https://github.com/go-git/go-git) | `v5.17.0` → `v5.17.1` | ![age](https://developer.mend.io/api/mc/badges/age/go/github.com%2fgo-git%2fgo-git%2fv5/v5.17.1?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/go/github.com%2fgo-git%2fgo-git%2fv5/v5.17.0/v5.17.1?slim=true) |

---

### go-git missing validation decoding Index v4 files leads to panic
[CVE-2026-33762](https://nvd.nist.gov/vuln/detail/CVE-2026-33762) / [GHSA-gm2x-2g9h-ccm8](GHSA-gm2x-2g9h-ccm8)

<details>
<summary>More information</summary>

#### Details
##### Impact

`go-git`’s index decoder for format version 4 fails to validate the path name prefix length before applying it to the previously decoded path name. A maliciously crafted index file can trigger an out-of-bounds slice operation, resulting in a runtime panic during normal index parsing.

This issue only affects Git index format version 4. Earlier formats (`go-git` supports only `v2` and `v3`) are not vulnerable to this issue.

An attacker able to supply a crafted `.git/index` file can cause applications using go-git to panic while reading the index. If the application does not recover from panics, this results in process termination, leading to a denial-of-service (DoS) condition.

Exploitation requires the ability to modify or inject a Git index file within the local repository in disk. This typically implies write access to the `.git` directory.

##### Patches

Users should upgrade to `v5.17.1`, or the latest `v6` [pseudo-version](https://go.dev/ref/mod#pseudo-versions), in order to mitigate this vulnerability.

##### Credit

go-git maintainers thank @&#8203;kq5y for finding and reporting this issue privately to the `go-git` project.

#### Severity
- CVSS Score: 2.8 / 10 (Low)
- Vector String: `CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L`

#### References
- [https://github.com/go-git/go-git/security/advisories/GHSA-gm2x-2g9h-ccm8](https://github.com/go-git/go-git/security/advisories/GHSA-gm2x-2g9h-ccm8)
- [https://github.com/go-git/go-git](https://github.com/go-git/go-git)

This data is provided by [OSV](https://osv.dev/vulnerability/GHSA-gm2x-2g9h-ccm8) and the [GitHub Advisory Database](https://github.com/github/advisory-database) ([CC-BY 4.0](https://github.com/github/advisory-database/blob/main/LICENSE.md)).
</details>

---

### go-git: Maliciously crafted idx file can cause asymmetric memory consumption
[CVE-2026-34165](https://nvd.nist.gov/vuln/detail/CVE-2026-34165) / [GHSA-jhf3-xxhw-2wpp](GHSA-jhf3-xxhw-2wpp)

<details>
<summary>More information</summary>

#### Details
##### Impact

A vulnerability has been identified in which a maliciously crafted `.idx` file can cause asymmetric memory consumption, potentially exhausting available memory and resulting in a Denial of Service (DoS) condition.

Exploitation requires write access to the local repository's `.git` directory, it order to create or alter existing `.idx` files.

##### Patches

Users should upgrade to `v5.17.1`, or the latest `v6` [pseudo-version](https://go.dev/ref/mod#pseudo-versions), in order to mitigate this vulnerability.

##### Credit

The go-git maintainers thank @&#8203;kq5y for finding and reporting this issue privately to the `go-git` project.

#### Severity
- CVSS Score: 5.0 / 10 (Medium)
- Vector String: `CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H`

#### References
- [https://github.com/go-git/go-git/security/advisories/GHSA-jhf3-xxhw-2wpp](https://github.com/go-git/go-git/security/advisories/GHSA-jhf3-xxhw-2wpp)
- [https://github.com/go-git/go-git](https://github.com/go-git/go-git)
- [https://github.com/go-git/go-git/releases/tag/v5.17.1](https://github.com/go-git/go-git/releases/tag/v5.17.1)

This data is provided by [OSV](https://osv.dev/vulnerability/GHSA-jhf3-xxhw-2wpp) and the [GitHub Advisory Database](https://github.com/github/advisory-database) ([CC-BY 4.0](https://github.com/github/advisory-database/blob/main/LICENSE.md)).
</details>

---

### Release Notes

<details>
<summary>go-git/go-git (github.com/go-git/go-git/v5)</summary>

### [`v5.17.1`](https://github.com/go-git/go-git/releases/tag/v5.17.1)

[Compare Source](go-git/go-git@v5.17.0...v5.17.1)

#### What's Changed

- build: Update module github.com/cloudflare/circl to v1.6.3 \[SECURITY] (releases/v5.x) by [@&#8203;go-git-renovate](https://github.com/go-git-renovate)\[bot] in [#&#8203;1930](go-git/go-git#1930)
- \[v5] plumbing: format/index, Improve v4 entry name validation by [@&#8203;pjbgf](https://github.com/pjbgf) in [#&#8203;1935](go-git/go-git#1935)
- \[v5] plumbing: format/idxfile, Fix version and fanout checks by [@&#8203;pjbgf](https://github.com/pjbgf) in [#&#8203;1937](go-git/go-git#1937)

**Full Changelog**: <go-git/go-git@v5.17.0...v5.17.1>

</details>

---

### Configuration

📅 **Schedule**: Branch creation - "" (UTC), Automerge - Between 12:00 AM and 03:59 AM ( * 0-3 * * * ) (UTC).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0My45OS4xIiwidXBkYXRlZEluVmVyIjoiNDMuOTkuMSIsInRhcmdldEJyYW5jaCI6ImZvcmdlam8iLCJsYWJlbHMiOlsiZGVwZW5kZW5jeS11cGdyYWRlIiwidGVzdC9ub3QtbmVlZGVkIl19-->

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/11897
Reviewed-by: Mathieu Fenniak <mfenniak@noreply.codeberg.org>
Co-authored-by: Renovate Bot <bot@kriese.eu>
Co-committed-by: Renovate Bot <bot@kriese.eu>
arthurzam pushed a commit to gentoo-golang-dist/forgejo-runner that referenced this pull request Apr 4, 2026
This PR contains the following updates:

| Package | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
| [github.com/go-git/go-git/v5](https://github.com/go-git/go-git) | `v5.17.0` → `v5.17.1` | ![age](https://developer.mend.io/api/mc/badges/age/go/github.com%2fgo-git%2fgo-git%2fv5/v5.17.1?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/go/github.com%2fgo-git%2fgo-git%2fv5/v5.17.0/v5.17.1?slim=true) |

---

### go-git missing validation decoding Index v4 files leads to panic
[CVE-2026-33762](https://nvd.nist.gov/vuln/detail/CVE-2026-33762) / [GHSA-gm2x-2g9h-ccm8](GHSA-gm2x-2g9h-ccm8)

<details>
<summary>More information</summary>

#### Details
##### Impact

`go-git`’s index decoder for format version 4 fails to validate the path name prefix length before applying it to the previously decoded path name. A maliciously crafted index file can trigger an out-of-bounds slice operation, resulting in a runtime panic during normal index parsing.

This issue only affects Git index format version 4. Earlier formats (`go-git` supports only `v2` and `v3`) are not vulnerable to this issue.

An attacker able to supply a crafted `.git/index` file can cause applications using go-git to panic while reading the index. If the application does not recover from panics, this results in process termination, leading to a denial-of-service (DoS) condition.

Exploitation requires the ability to modify or inject a Git index file within the local repository in disk. This typically implies write access to the `.git` directory.

##### Patches

Users should upgrade to `v5.17.1`, or the latest `v6` [pseudo-version](https://go.dev/ref/mod#pseudo-versions), in order to mitigate this vulnerability.

##### Credit

go-git maintainers thank @&#8203;kq5y for finding and reporting this issue privately to the `go-git` project.

#### Severity
- CVSS Score: 2.8 / 10 (Low)
- Vector String: `CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L`

#### References
- [https://github.com/go-git/go-git/security/advisories/GHSA-gm2x-2g9h-ccm8](https://github.com/go-git/go-git/security/advisories/GHSA-gm2x-2g9h-ccm8)
- [https://github.com/go-git/go-git](https://github.com/go-git/go-git)

This data is provided by [OSV](https://osv.dev/vulnerability/GHSA-gm2x-2g9h-ccm8) and the [GitHub Advisory Database](https://github.com/github/advisory-database) ([CC-BY 4.0](https://github.com/github/advisory-database/blob/main/LICENSE.md)).
</details>

---

### go-git: Maliciously crafted idx file can cause asymmetric memory consumption
[CVE-2026-34165](https://nvd.nist.gov/vuln/detail/CVE-2026-34165) / [GHSA-jhf3-xxhw-2wpp](GHSA-jhf3-xxhw-2wpp)

<details>
<summary>More information</summary>

#### Details
##### Impact

A vulnerability has been identified in which a maliciously crafted `.idx` file can cause asymmetric memory consumption, potentially exhausting available memory and resulting in a Denial of Service (DoS) condition.

Exploitation requires write access to the local repository's `.git` directory, it order to create or alter existing `.idx` files.

##### Patches

Users should upgrade to `v5.17.1`, or the latest `v6` [pseudo-version](https://go.dev/ref/mod#pseudo-versions), in order to mitigate this vulnerability.

##### Credit

The go-git maintainers thank @&#8203;kq5y for finding and reporting this issue privately to the `go-git` project.

#### Severity
- CVSS Score: 5.0 / 10 (Medium)
- Vector String: `CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H`

#### References
- [https://github.com/go-git/go-git/security/advisories/GHSA-jhf3-xxhw-2wpp](https://github.com/go-git/go-git/security/advisories/GHSA-jhf3-xxhw-2wpp)
- [https://github.com/go-git/go-git](https://github.com/go-git/go-git)
- [https://github.com/go-git/go-git/releases/tag/v5.17.1](https://github.com/go-git/go-git/releases/tag/v5.17.1)

This data is provided by [OSV](https://osv.dev/vulnerability/GHSA-jhf3-xxhw-2wpp) and the [GitHub Advisory Database](https://github.com/github/advisory-database) ([CC-BY 4.0](https://github.com/github/advisory-database/blob/main/LICENSE.md)).
</details>

---

### Release Notes

<details>
<summary>go-git/go-git (github.com/go-git/go-git/v5)</summary>

### [`v5.17.1`](https://github.com/go-git/go-git/releases/tag/v5.17.1)

[Compare Source](go-git/go-git@v5.17.0...v5.17.1)

#### What's Changed

- build: Update module github.com/cloudflare/circl to v1.6.3 \[SECURITY] (releases/v5.x) by [@&#8203;go-git-renovate](https://github.com/go-git-renovate)\[bot] in [#&#8203;1930](go-git/go-git#1930)
- \[v5] plumbing: format/index, Improve v4 entry name validation by [@&#8203;pjbgf](https://github.com/pjbgf) in [#&#8203;1935](go-git/go-git#1935)
- \[v5] plumbing: format/idxfile, Fix version and fanout checks by [@&#8203;pjbgf](https://github.com/pjbgf) in [#&#8203;1937](go-git/go-git#1937)

**Full Changelog**: <go-git/go-git@v5.17.0...v5.17.1>

</details>

---

### Configuration

📅 **Schedule**: Branch creation - "" (UTC), Automerge - Between 12:00 AM and 03:59 AM ( * 0-3 * * * ) (UTC).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0My45OS4xIiwidXBkYXRlZEluVmVyIjoiNDMuOTkuMSIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOlsiS2luZC9EZXBlbmRlbmN5VXBkYXRlIiwicnVuLWVuZC10by1lbmQtdGVzdHMiXX0=-->

Reviewed-on: https://code.forgejo.org/forgejo/runner/pulls/1466
Reviewed-by: Mathieu Fenniak <mfenniak@noreply.code.forgejo.org>
Co-authored-by: Renovate Bot <bot@kriese.eu>
Co-committed-by: Renovate Bot <bot@kriese.eu>
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