Issues

tarfile and zipfile write through an existing symlink or hard link when extracting a file

python/cpython#160446 · opened

on Oct 23, 2026

pyexpat: CPython can be crashed through resetting `StartDoctypeDeclHandler` with pyexpat at the wrong time

python/cpython#160442 · opened

on Oct 23, 2026

Concurrent mutation of cached slot names can crash default object state collection

python/cpython#160440 · opened

on Oct 23, 2026

C API: copying a PyStatus emits -Wdeprecated-declarations in C++ with clang since gh-158080

python/cpython#160436 · opened

on Oct 23, 2026

`TimedRotatingFileHandler` misnames backups around DST changes

python/cpython#160433 · opened

on Oct 23, 2026

1

selectors: modify() of poll-based selectors accepts an invalid event mask

python/cpython#160431 · opened

on Oct 23, 2026

1

asyncio: Windows socket reset during Proactor cleanup skips socket closure and transport detachment

python/cpython#160429 · opened

on Oct 23, 2026

`hasattr(stream, "buffer") fails with ValueError if buffer is detached

python/cpython#160427 · opened

on Oct 23, 2026

Possible lost notification in threading.Condition when a waiter times out

python/cpython#160414 · opened

on Oct 23, 2026

1

Use critical sections in _warnings.c rather than mutex

python/cpython#160397 · opened

on Oct 22, 2026

Add an opt-in Windows ARM64EC build configuration

python/cpython#160395 · opened

on Oct 22, 2026

`test_remote_exec_deleted_libpython` can fail when `DT_RPATH` selects `libpython`

python/cpython#160388 · opened

on Oct 22, 2026

Sync with importlib_metadata for Python 3.16

python/cpython#160386 · opened

on Oct 22, 2026

Clang PGO profiles can be overwritten when PIDs are reused

python/cpython#160380 · opened

on Oct 22, 2026

Pending bug

python/cpython#160369 · opened

on Oct 22, 2026

Crash (SIGABRT): Assertion `year >= 1' failed in` days_before_year` when unpickling datetime with year 0

python/cpython#160358 · opened

on Oct 22, 2026

4

readline leaks the completer delimiters buffer on re-import

python/cpython#160353 · opened

on Oct 22, 2026

1

Free-threading: concurrent send() on a shared aclose() awaitable can resume the async generator instead of closing it

python/cpython#160347 · opened

on Oct 22, 2026

1

test_sampling_with_collapsed_export fails when the profiler records an unreadable frame

python/cpython#160334 · opened

on Oct 22, 2026

Remove SIMD support for BLAKE-2 and HMAC-BLAKE-2

python/cpython#160333 · opened

on Oct 22, 2026

`io.StringIO` crashes or returns garbage when used after a `MemoryError`

python/cpython#160324 · opened

on Oct 22, 2026

asyncio socket transport sends modified data when a bytearray is changed after `write()`

python/cpython#160321 · opened

on Oct 22, 2026

1

`re.Pattern.match()` matches and can read out of bounds when `pos > endpos`

python/cpython#160316 · opened

on Oct 22, 2026

`lzma` and `bz2` silently ignore a damaged later stream as trailing data

python/cpython#160314 · opened

on Oct 22, 2026

One-shot `decompress()` in `gzip`, `bz2`, `lzma` and `compression.zstd` is quadratic in the number of members

python/cpython#160310 · opened

on Oct 22, 2026

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Issues

tarfile and zipfile write through an existing symlink or hard link when extracting a file

pyexpat: CPython can be crashed through resetting `StartDoctypeDeclHandler` with pyexpat at the wrong time

Concurrent mutation of cached slot names can crash default object state collection

C API: copying a PyStatus emits -Wdeprecated-declarations in C++ with clang since gh-158080

`TimedRotatingFileHandler` misnames backups around DST changes

selectors: modify() of poll-based selectors accepts an invalid event mask

asyncio: Windows socket reset during Proactor cleanup skips socket closure and transport detachment

`hasattr(stream, "buffer") fails with ValueError if buffer is detached

Possible lost notification in threading.Condition when a waiter times out

Use critical sections in _warnings.c rather than mutex

Add an opt-in Windows ARM64EC build configuration

`test_remote_exec_deleted_libpython` can fail when `DT_RPATH` selects `libpython`

Sync with importlib_metadata for Python 3.16

Clang PGO profiles can be overwritten when PIDs are reused

Pending bug

Crash (SIGABRT): Assertion `year >= 1' failed in` days_before_year` when unpickling datetime with year 0

readline leaks the completer delimiters buffer on re-import

Free-threading: concurrent send() on a shared aclose() awaitable can resume the async generator instead of closing it

test_sampling_with_collapsed_export fails when the profiler records an unreadable frame

Remove SIMD support for BLAKE-2 and HMAC-BLAKE-2

`io.StringIO` crashes or returns garbage when used after a `MemoryError`

asyncio socket transport sends modified data when a bytearray is changed after `write()`

`re.Pattern.match()` matches and can read out of bounds when `pos > endpos`

`lzma` and `bz2` silently ignore a damaged later stream as trailing data

One-shot `decompress()` in `gzip`, `bz2`, `lzma` and `compression.zstd` is quadratic in the number of members