Issues

Key handle leaks when the audit hook fails in `winreg`

python/cpython#159880 · opened

on Oct 20, 2026

run_with_limited_c_stack(size=...) is unsafe below Py_C_STACK_SIZE on platforms without stack-size detection

python/cpython#159879 · opened

on Oct 20, 2026

1

C stack limit detection is disabled on musl, so deep C recursion crashes instead of raising RecursionError

python/cpython#159876 · opened

on Oct 20, 2026

1

asyncio: after an SSL connection is lost, `transport.close()` leaves a transport whose `write()`, `set_protocol()`, … raise `AttributeError`

python/cpython#159875 · opened

on Oct 20, 2026

collections.UserString.startswith() and endswith() reject UserString arguments

python/cpython#159868 · opened

on Oct 20, 2026

profiling.sampling: exception mode drops samples from blocked handlers

python/cpython#159865 · opened

on Oct 20, 2026

Free-threaded: concurrent syslog.openlog() and sys.argv[0] assignment crash the interpreter

python/cpython#159864 · opened

on Oct 20, 2026

2

Free-threading: QSBR thread states false-share on 128-byte cache lines (Apple Silicon), CPU-bound threads reach ~6× on 14 cores where processes reach ~10×

python/cpython#159860 · opened

on Oct 20, 2026

1

email: set_content() raises AttributeError for memoryview with 7bit, 8bit or binary CTE

python/cpython#159858 · opened

on Oct 20, 2026

Shell `python3-config` prints empty or wrong paths when its installation path contains spaces

python/cpython#159819 · opened

on Oct 20, 2026

Do not leave stale OpenSSL errors in `_hashlib`

python/cpython#159815 · opened

on Oct 19, 2026

`_hashlib`: GIL may be released while attempting to set an exception

python/cpython#159811 · opened

on Oct 19, 2026

Struct definitions in the documentation differ from the implementation

python/cpython#159808 · opened

on Oct 19, 2026

1

warnings.simplefilter("once") emits the same warning once per module

python/cpython#159792 · opened

on Oct 19, 2026

HACL* `update()` errors are handled without a thread state

python/cpython#159786 · opened

on Oct 19, 2026

Python 3.14 crash randomly on AMD64 Debian root 3.14 buildbot

python/cpython#159764 · opened

on Oct 19, 2026

11

Sharing a memoryview iterator across threads can abort free-threaded CPython

python/cpython#159760 · opened

on Oct 19, 2026

Fix minor safety issues

python/cpython#159739 · opened

on Oct 19, 2026

pathlib match, full_match and glob take exponential time on short patterns because glob.translate skips fnmatch's atomic-group rewrite

python/cpython#159717 · opened

on Oct 19, 2026

2

Speed up integer searching in memoryview and array.array

python/cpython#159716 · opened

on Oct 19, 2026

2

`ZoneInfo` mishandles TZ footer rules spanning a year boundary

python/cpython#159715 · opened

on Oct 19, 2026

`ZoneInfo` evaluates TZ rule `J59` as February 29 in leap years

python/cpython#159714 · opened

on Oct 19, 2026

`ZoneInfo` evaluates zero-based TZ day-of-year rules one day early

python/cpython#159712 · opened

on Oct 19, 2026

`ZoneInfo.utcoffset()` gives the wrong offset near the last explicit TZif transition

python/cpython#159708 · opened

on Oct 19, 2026

Pure-Python `ZoneInfo.fromutc()` misses folds at the last explicit transition before TZ footer rules

python/cpython#159707 · opened

on Oct 19, 2026

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Issues

Key handle leaks when the audit hook fails in `winreg`

run_with_limited_c_stack(size=...) is unsafe below Py_C_STACK_SIZE on platforms without stack-size detection

C stack limit detection is disabled on musl, so deep C recursion crashes instead of raising RecursionError

asyncio: after an SSL connection is lost, `transport.close()` leaves a transport whose `write()`, `set_protocol()`, … raise `AttributeError`

collections.UserString.startswith() and endswith() reject UserString arguments

profiling.sampling: exception mode drops samples from blocked handlers

Free-threaded: concurrent syslog.openlog() and sys.argv[0] assignment crash the interpreter

Free-threading: QSBR thread states false-share on 128-byte cache lines (Apple Silicon), CPU-bound threads reach ~6× on 14 cores where processes reach ~10×

email: set_content() raises AttributeError for memoryview with 7bit, 8bit or binary CTE

Shell `python3-config` prints empty or wrong paths when its installation path contains spaces

Do not leave stale OpenSSL errors in `_hashlib`

`_hashlib`: GIL may be released while attempting to set an exception

Struct definitions in the documentation differ from the implementation

warnings.simplefilter("once") emits the same warning once per module

HACL* `update()` errors are handled without a thread state

Python 3.14 crash randomly on AMD64 Debian root 3.14 buildbot

Sharing a memoryview iterator across threads can abort free-threaded CPython

Fix minor safety issues

pathlib match, full_match and glob take exponential time on short patterns because glob.translate skips fnmatch's atomic-group rewrite

Speed up integer searching in memoryview and array.array

`ZoneInfo` mishandles TZ footer rules spanning a year boundary

`ZoneInfo` evaluates TZ rule `J59` as February 29 in leap years

`ZoneInfo` evaluates zero-based TZ day-of-year rules one day early

`ZoneInfo.utcoffset()` gives the wrong offset near the last explicit TZif transition

Pure-Python `ZoneInfo.fromutc()` misses folds at the last explicit transition before TZ footer rules