Issues

pdb: breakpoint() is ignored after quitting a previous session with q

python/cpython#160643 · opened

on Oct 25, 2026

textwrap truncation discards a broken long word (and, for shorten(), the whole text) instead of breaking it further

python/cpython#160633 · opened

on Oct 25, 2026

[macOS x86_64, python >= 3.14] Process hangs when importing ctypes from embedded interpreter in a x86_64 macOS executable with enabled hardened runtime

python/cpython#160627 · opened

on Oct 24, 2026

Windows: python.exe fails to start from a long path because of DLL manifests

python/cpython#160624 · opened

on Oct 24, 2026

socket.recv() and recvfrom() with MSG_TRUNC raise ValueError and lose the datagram since 3.15.1

python/cpython#160622 · opened

on Oct 24, 2026

check_hostname defaults to true when true is invalid

python/cpython#160605 · opened

on Oct 24, 2026

1

`profiling.sampling` in `--binary` mode raises a `UnicodeEncodeError` while collecting the samples

python/cpython#160601 · opened

on Oct 24, 2026

2

mailbox.Babyl returns labels as bytes after reading a mailbox file

python/cpython#160598 · opened

on Oct 24, 2026

Incorrectly formatted error message in `asyncio.proactor_events.sendto()`

python/cpython#160596 · opened

on Oct 24, 2026

free-threaded: setiter_iternext releases the set once per racing thread

python/cpython#160573 · opened

on Oct 24, 2026

1

socket.fromfd() leaks the dup()'d fd when family/type/proto are invalid

python/cpython#160561 · opened

on Oct 24, 2026

7

csv.Sniffer.sniff() takes quadratic time on long runs of spaces

python/cpython#160556 · opened

on Oct 24, 2026

regrtest --parallel-threads shares TestCase._cleanups between threads

python/cpython#160543 · opened

on Oct 23, 2026

`test_profiling` is flaky

python/cpython#160529 · opened

on Oct 23, 2026

4

`xml.dom.minidom.parseString()` takes quadratic time on text delivered in many pieces

python/cpython#160525 · opened

on Oct 23, 2026

Stateful CJK incremental encoders keep the shift state after a failed `encode()`

python/cpython#160522 · opened

on Oct 23, 2026

`hz` codec encodes `~` as a single `~` when the output buffer fills mid-escape

python/cpython#160518 · opened

on Oct 23, 2026

`start_tls()` does not call `connection_lost()` when the handshake is aborted

python/cpython#160513 · opened

on Oct 23, 2026

test_urllib: two urlopen_HttpTests tests fail when an HTTPS proxy is configured

python/cpython#160511 · opened

on Oct 23, 2026

`os.path.realpath()` on Windows misresolves a broken symlink reached through a directory symlink

python/cpython#160506 · opened

on Oct 23, 2026

test_str: the UCS4 adaptive search path is never exercised

python/cpython#160501 · opened

on Oct 23, 2026

asyncio TLS server memory grows without bound for a peer that stops reading

python/cpython#160499 · opened

on Oct 23, 2026

1

sre: the UCS2 and UCS4 variants of charset_loc_ignore are unreachable

python/cpython#160498 · opened

on Oct 23, 2026

Data race between `_PyObject_TryGetInstanceAttribute` and `clear_inline_values`

python/cpython#160496 · opened

on Oct 23, 2026

Improve performance of exception raise

python/cpython#160473 · opened

on Oct 23, 2026

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Issues

pdb: breakpoint() is ignored after quitting a previous session with q

textwrap truncation discards a broken long word (and, for shorten(), the whole text) instead of breaking it further

[macOS x86_64, python >= 3.14] Process hangs when importing ctypes from embedded interpreter in a x86_64 macOS executable with enabled hardened runtime

Windows: python.exe fails to start from a long path because of DLL manifests

socket.recv() and recvfrom() with MSG_TRUNC raise ValueError and lose the datagram since 3.15.1

check_hostname defaults to true when true is invalid

`profiling.sampling` in `--binary` mode raises a `UnicodeEncodeError` while collecting the samples

mailbox.Babyl returns labels as bytes after reading a mailbox file

Incorrectly formatted error message in `asyncio.proactor_events.sendto()`

free-threaded: setiter_iternext releases the set once per racing thread

socket.fromfd() leaks the dup()'d fd when family/type/proto are invalid

csv.Sniffer.sniff() takes quadratic time on long runs of spaces

regrtest --parallel-threads shares TestCase._cleanups between threads

`test_profiling` is flaky

`xml.dom.minidom.parseString()` takes quadratic time on text delivered in many pieces

Stateful CJK incremental encoders keep the shift state after a failed `encode()`

`hz` codec encodes `~` as a single `~` when the output buffer fills mid-escape

`start_tls()` does not call `connection_lost()` when the handshake is aborted

test_urllib: two urlopen_HttpTests tests fail when an HTTPS proxy is configured

`os.path.realpath()` on Windows misresolves a broken symlink reached through a directory symlink

test_str: the UCS4 adaptive search path is never exercised

asyncio TLS server memory grows without bound for a peer that stops reading

sre: the UCS2 and UCS4 variants of charset_loc_ignore are unreachable

Data race between `_PyObject_TryGetInstanceAttribute` and `clear_inline_values`

Improve performance of exception raise