Issues

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

python/cpython#160601 · opened

on Oct 24, 2026

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

Py_Initialize() in a background thread crashes on free-threaded release builds of 3.14 after the mimalloc 2.5.2 update

python/cpython#160588 · opened

on Oct 24, 2026

`pprint.pp` doesn't document the addition of `expand`

python/cpython#160586 · opened

on Oct 24, 2026

3

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

python/cpython#160573 · opened

on Oct 24, 2026

2

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

python/cpython#160561 · opened

on Oct 24, 2026

8

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

python/cpython#160556 · opened

on Oct 24, 2026

Crash when a multi-threaded `ZstdCompressor` with a `ZstdDict` is freed while compressing

python/cpython#160549 · opened

on Oct 23, 2026

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

python/cpython#160543 · opened

on Oct 23, 2026

Crash when the GC collects a multi-threaded `ZstdCompressor` together with its `ZstdDict`

python/cpython#160535 · 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

asyncio SSL transport ignores `ssl_shutdown_timeout` after the peer sends EOF

python/cpython#160520 · 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

Colorful `pprint`

python/cpython#160466 · opened

on Oct 23, 2026

5

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Issues

`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()`

Py_Initialize() in a background thread crashes on free-threaded release builds of 3.14 after the mimalloc 2.5.2 update

`pprint.pp` doesn't document the addition of `expand`

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

Crash when a multi-threaded `ZstdCompressor` with a `ZstdDict` is freed while compressing

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

Crash when the GC collects a multi-threaded `ZstdCompressor` together with its `ZstdDict`

`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()`

asyncio SSL transport ignores `ssl_shutdown_timeout` after the peer sends EOF

`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

Colorful `pprint`