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[security] Please upgrade bundled Expat to 2.7.4 (e.g. for the fixes to CVE-2026-24515 and CVE-2026-25210)

3.10only security fixesonly security fixes

3.11only security fixesonly security fixes

3.12only security fixesonly security fixes

3.13bugs and security fixesbugs and security fixes

3.14bugs and security fixesbugs and security fixes

3.15new features, bugs and security fixesnew features, bugs and security fixes

extension-modulesC modules in the Modules dirC modules in the Modules dir

topic-XML

type-securityA security issueA security issue

Status: Open.

#144363 In python/cpython;

·hartwork openedon Jan 31, 2026

PEP696 + PEP749: Defer evaluation of defaults when parametrizing

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#144361 In python/cpython;

·randolf-scholz openedon Jan 31, 2026

Data race in set iterator length_hint under no-gil

interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

topic-free-threading

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#144356 In python/cpython;

·hyongtao-code openedon Jan 31, 2026

Flaky test_annotationlib test due to non-deterministic set iteration ordering

3.14bugs and security fixesbugs and security fixes

testsTests in the Lib/test dirTests in the Lib/test dir

topic-typing

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#144348 In python/cpython;

·colesbury openedon Jan 30, 2026

sqlite3 connections always create a reference cycle

extension-modulesC modules in the Modules dirC modules in the Modules dir

topic-sqlite3

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#144345 In python/cpython;

·takluyver openedon Jan 30, 2026

Modify documentation of cmd.Cmd to indicate subtle behaviours

docsDocumentation in the Doc dirDocumentation in the Doc dir

triagedThe issue has been accepted as valid by a triager.The issue has been accepted as valid by a triager.

Status: Open.

#144338 In python/cpython;

·pythonhacker openedon Jan 30, 2026

asynciomodule.c performance degradation in free-threading under heavy load

extension-modulesC modules in the Modules dirC modules in the Modules dir

topic-asyncio

topic-free-threading

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#144337 In python/cpython;

·jgrave3 openedon Jan 30, 2026

Tachyon sample dump/replay crashes

stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory

topic-profiling

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#144336 In python/cpython;

·hauntsaninja openedon Jan 30, 2026

<code>classmethod</code> and <code>staticmethod</code> can crash with <code>NULL</code> / uninitialized callables

3.13bugs and security fixesbugs and security fixes

3.14bugs and security fixesbugs and security fixes

3.15new features, bugs and security fixesnew features, bugs and security fixes

interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

type-crashA hard crash of the interpreter, possibly with a core dumpA hard crash of the interpreter, possibly with a core dump

Status: Open.

#144330 In python/cpython;

·colesbury openedon Jan 29, 2026

Error messages for <code>{}</code> style formatters for int, float, str, and complex

interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#144325 In python/cpython;

·Lil-Ran openedon Jan 29, 2026

Unexpected result with <code>NamedTuple(name, zip(keys, values))</code>

stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory

topic-typing

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#144321 In python/cpython;

·randolf-scholz openedon Jan 29, 2026

Add huge pages support for pymalloc

interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#144319 In python/cpython;

·pablogsal openedon Jan 29, 2026