Issues

BufferedIOBase.readinto raises `TypeError` when called on a non-blocking streams block with no data

python/cpython#162031 · opened

on Nov 15, 2026

Pure Python JSON decoder reports the error position one character past an invalid escape

python/cpython#162028 · opened

on Nov 15, 2026

sys.monitoring: wrong branch events for async comprehensions and for a second `async for` loop

python/cpython#162027 · opened

on Nov 14, 2026

1

macOS pipe writable notification can leave subprocess.communicate() blocked past timeout

python/cpython#162016 · opened

on Nov 14, 2026

imaplib: a rejected APPEND leaves its message pending as the literal of the next command

python/cpython#162010 · opened

on Nov 14, 2026

1

Free-threaded: per-thread refcount arrays cost 8 bytes x unique-id pool size of RSS in every thread

python/cpython#161998 · opened

on Nov 14, 2026

1

Segfault in `Interpreter.exec()` when the uncaught exception's `str` raises

python/cpython#161996 · opened

on Nov 14, 2026

textwrap: wrapping a long word takes quadratic time

python/cpython#161977 · opened

on Nov 14, 2026

SequenceMatcher.get_grouped_opcodes() changes the result of later get_opcodes() calls

python/cpython#161973 · opened

on Nov 14, 2026

3

cmath.log(0, base) returns (-inf+nanj) instead of raising ValueError

python/cpython#161972 · opened

on Nov 14, 2026

4

collections.UserString.replace() rejects the count keyword

python/cpython#161970 · opened

on Nov 14, 2026

email: UnboundLocalError parsing a Message-ID whose domain literal starts with whitespace

python/cpython#161966 · opened

on Nov 14, 2026

`importlib.util.LazyLoader` deadlocks when two threads first-touch modules in an import cycle

python/cpython#161962 · opened

on Nov 13, 2026

[Security] Memory Exhaustion (OOM) and Resource Leak via crafted PAX Headers in tarfile

python/cpython#161955 · opened

on Nov 13, 2026

3

zipfile honors inconsistent compression method state when extracting

python/cpython#161945 · opened

on Nov 13, 2026

1

Freeze encodings module during startup

python/cpython#161941 · opened

on Nov 13, 2026

Make print() use a single write() call

python/cpython#161934 · opened

on Nov 13, 2026

ProcessPoolExecutor: a worker spawned on demand by submit() can die unnoticed (no BrokenProcessPool, hang) with forkserver/spawn

python/cpython#161931 · opened

on Nov 13, 2026

sys.monitoring: `async for` emits BRANCH_RIGHT when `anext` raises an exception other than StopAsyncIteration

python/cpython#161928 · opened

on Nov 13, 2026

1

`complex(x)` ignores an overridden `float` of a `float` subclass since 3.14

python/cpython#161926 · opened

on Nov 13, 2026

1

iconv codec: encoding names that glibc strips to nothing resolve to the locale encoding

python/cpython#161924 · opened

on Nov 13, 2026

1

wrong/ambiguous type descriptions for `LogRecord.exc_info`

python/cpython#161918 · opened

on Nov 13, 2026

2

Class creation with many annotated classes in one module is superlinear on 3.14 (annotationlib FORWARDREF path, suspected: module globals copied per call)

python/cpython#161912 · opened

on Nov 12, 2026

3

Fold PUSH_NULL; LOAD_CONST None into GET_AWAITABLE and GET_ANEXT

python/cpython#161875 · opened

on Nov 12, 2026

1

test_build_details.test_platform fails for 32-bit builds on a 64-bit kernel

python/cpython#161870 · opened

on Nov 12, 2026

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Issues

BufferedIOBase.readinto raises `TypeError` when called on a non-blocking streams block with no data

Pure Python JSON decoder reports the error position one character past an invalid escape

sys.monitoring: wrong branch events for async comprehensions and for a second `async for` loop

macOS pipe writable notification can leave subprocess.communicate() blocked past timeout

imaplib: a rejected APPEND leaves its message pending as the literal of the next command

Free-threaded: per-thread refcount arrays cost 8 bytes x unique-id pool size of RSS in every thread

Segfault in `Interpreter.exec()` when the uncaught exception's `str` raises

textwrap: wrapping a long word takes quadratic time

SequenceMatcher.get_grouped_opcodes() changes the result of later get_opcodes() calls

cmath.log(0, base) returns (-inf+nanj) instead of raising ValueError

collections.UserString.replace() rejects the count keyword

email: UnboundLocalError parsing a Message-ID whose domain literal starts with whitespace

`importlib.util.LazyLoader` deadlocks when two threads first-touch modules in an import cycle

[Security] Memory Exhaustion (OOM) and Resource Leak via crafted PAX Headers in tarfile

zipfile honors inconsistent compression method state when extracting

Freeze encodings module during startup

Make print() use a single write() call

ProcessPoolExecutor: a worker spawned on demand by submit() can die unnoticed (no BrokenProcessPool, hang) with forkserver/spawn

sys.monitoring: `async for` emits BRANCH_RIGHT when `anext` raises an exception other than StopAsyncIteration

`complex(x)` ignores an overridden `float` of a `float` subclass since 3.14

iconv codec: encoding names that glibc strips to nothing resolve to the locale encoding

wrong/ambiguous type descriptions for `LogRecord.exc_info`

Class creation with many annotated classes in one module is superlinear on 3.14 (annotationlib FORWARDREF path, suspected: module globals copied per call)

Fold PUSH_NULL; LOAD_CONST None into GET_AWAITABLE and GET_ANEXT

test_build_details.test_platform fails for 32-bit builds on a 64-bit kernel