Issues

Free-threaded: pages freed by other threads are not returned while the owning thread is idle (and the default purge delay keeps them after it exits)

python/cpython#161999 · opened

on Nov 14, 2026

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

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

python/cpython#161996 · opened

on Nov 14, 2026

urllib.parse: port validation at parse time (gh-88037) breaks multi-host URLs; backported to 3.14 and 3.15

python/cpython#161987 · opened

on Nov 14, 2026

2

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

2

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

python/cpython#161972 · opened

on Nov 14, 2026

3

collections.UserString.replace() rejects the count keyword

python/cpython#161970 · opened

on Nov 14, 2026

`x = seq` raises TypeError for int subclasses and IntEnum where `x seq` works

python/cpython#161968 · 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

`python -m asyncio ps` and `python -m asyncio pstree` fail for task names that are str subclasses

python/cpython#161952 · opened

on Nov 13, 2026

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

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

Short, frequent GIL releases block other threads for seconds

python/cpython#161868 · opened

on Nov 12, 2026

2

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Issues

Free-threaded: pages freed by other threads are not returned while the owning thread is idle (and the default purge delay keeps them after it exits)

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

urllib.parse: port validation at parse time (gh-88037) breaks multi-host URLs; backported to 3.14 and 3.15

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

`x = seq` raises TypeError for int subclasses and IntEnum where `x seq` works

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

`python -m asyncio ps` and `python -m asyncio pstree` fail for task names that are str subclasses

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

Short, frequent GIL releases block other threads for seconds