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sentrivana merged 2 commits into from
Oct 20, 2026
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fix(attributes): Handle special float values correctly #8067

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fix(attributes): Handle special float values correctly
sentrivana Oct 20, 2026
b4e39f0
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sentrivana Oct 20, 2026
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3 changes: 3 additions & 0 deletions sentry_sdk/utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2168,6 +2168,9 @@
https://develop.sentry.dev/sdk/telemetry/attributes/
"""
if isinstance(val, (bool, int, float, str)):
if isinstance(val, float) and (math.isinf(val) or math.isnan(val)):
return str(val)

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@sentry/warden / warden: code-review

Non-finite float-array attributes still break envelope JSON serialization 

Homogeneous float lists and tuples containing NaN or infinity pass through `format_attribute` unchanged. `serialize_attribute` then emits them as array values, but envelope payloads are encoded with `json_dumps(allow_nan=False)`, which raises `ValueError`. Normalize non-finite elements in float arrays before serialization, or otherwise ensure the resulting payload is valid JSON.

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@sentry/warden / warden: find-bugs

Non-finite floats in list/tuple attributes still break envelope JSON 

Scalar NaN/Inf are stringified, but homogeneous float lists/tuples still keep non-finite values, so `json_dumps(..., allow_nan=False)` can fail and drop the envelope; sanitize array elements the same way (or reject/coerce the whole array).
Comment on lines +2171 to +2173

@sentry-warden sentry-warden Bot Oct 20, 2026

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Non-finite float-array attributes still break envelope JSON serialization

Homogeneous float lists and tuples containing NaN or infinity pass through format_attribute unchanged. serialize_attribute then emits them as array values, but envelope payloads are encoded with json_dumps(allow_nan=False), which raises ValueError. Normalize non-finite elements in float arrays before serialization, or otherwise ensure the resulting payload is valid JSON.

Evidence
  • format_attribute handles non-finite values only in its scalar-float branch; its homogeneous list and tuple branches return float elements unchanged.
  • serialize_attribute emits homogeneous lists as array values, so a value such as [float("nan")] remains in the payload.
  • Batchers place these serialized attributes in JSON payloads; PayloadRef.get_bytes() encodes them with json_dumps, which sets allow_nan=False and raises ValueError for NaN or infinity.
Also found at 1 additional location
  • tests/test_attributes.py:228-234

Identified by Warden · code-review · D6L-C4X

return val

if isinstance(val, (list, tuple)) and not val:
Expand Down
31 changes: 31 additions & 0 deletions tests/test_attributes.py
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Original file line number Diff line number Diff line change
@@ -1,3 +1,5 @@
import pytest

import sentry_sdk


Expand Down Expand Up @@ -221,3 +223,32 @@
assert span["attributes"]["user.name"] == "username"
assert span["attributes"]["user.email"] == "username@example.com"
assert span["attributes"]["user.ip_address"] == "127.0.0.1"


@pytest.mark.parametrize(
"bad_value, expected",
[
(float("inf"), "inf"),
(float("-inf"), "-inf"),
(float("nan"), "nan"),
],

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@sentry/warden / warden: code-review

[D6L-C4X] Non-finite float-array attributes still break envelope JSON serialization (additional location) 

Homogeneous float lists and tuples containing NaN or infinity pass through `format_attribute` unchanged. `serialize_attribute` then emits them as array values, but envelope payloads are encoded with `json_dumps(allow_nan=False)`, which raises `ValueError`. Normalize non-finite elements in float arrays before serialization, or otherwise ensure the resulting payload is valid JSON.

Check warning on line 234 in tests/test_attributes.py

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@sentry/warden / warden: find-bugs

[DHD-DR5] Non-finite floats in list/tuple attributes still break envelope JSON (additional location) 

Scalar NaN/Inf are stringified, but homogeneous float lists/tuples still keep non-finite values, so `json_dumps(..., allow_nan=False)` can fail and drop the envelope; sanitize array elements the same way (or reject/coerce the whole array).
)
def test_unserializable_attributes(sentry_init, capture_items, bad_value, expected):
sentry_init(
traces_sample_rate=1.0,
trace_lifecycle="stream",
)

items = capture_items("span")

with sentry_sdk.traces.start_span(name="login", attributes={"bad_attr": bad_value}):
pass

sentry_sdk.flush()

assert items

(span,) = [item.payload for item in items]

assert "bad_attr" in span["attributes"]
assert span["attributes"]["bad_attr"] == expected
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