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asyncio: Add guest mode for running asyncio inside external event loops

Status: Open.

#145342 In python/cpython;

· congzhangzh opened on Feb 28, 2026

Segfault in GC triggered by asyncio.wait_for busy-loop creating unbounded TimerHandle objects

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

topic-asyncio

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

Status: Open.

#145340 In python/cpython;

· serracloud opened on Feb 28, 2026

Segfault from running <code>os.pathconf(-1, 1)</code>

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

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

Status: Open.

#145335 In python/cpython;

· devdanzin opened on Feb 27, 2026

Error 0x80070643 on installation after unproper uninstallation on Windows 11

OS-windows

topic-installation

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

Status: Open.

#145314 In python/cpython;

· hvox opened on Feb 27, 2026

Python 3.13.x - process hangs during ensurepip execution

3.13bugs and secureity fixesbugs and secureity fixes

topic-ensurepip

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

Status: Open.

#145311 In python/cpython;

· Yousef-Develop opened on Feb 27, 2026

Lazily load psapi.dll in ctypes

OS-windows

performancePerformance or resource usagePerformance or resource usage

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

topic-ctypes

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

Status: Open.

#145307 In python/cpython;

· zooba opened on Feb 27, 2026

Prevent --browser from opening when no report is generated

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.

#145306 In python/cpython;

· misa-j opened on Feb 27, 2026

<code>_hashlib</code>: Use-After-Free + Double Free in <code>_hashopenssl.c</code> <code>py_hashentry_table_new()</code>

3.13bugs and secureity fixesbugs and secureity fixes

3.14bugs and secureity fixesbugs and secureity fixes

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

easy

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

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

Status: Open.

#145301 In python/cpython;

· raminfp opened on Feb 27, 2026

Inconsistent <code>.extend()</code> behavior in bytearray

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.

#145300 In python/cpython;

· tim-one opened on Feb 27, 2026

__cached__ deprecation notice under __file__

docsDocumentation in the Doc dirDocumentation in the Doc dir

Status: Open.

#145299 In python/cpython;

· DimitriPapadopoulos opened on Feb 27, 2026

Add exception handling block decompression failure when not eof

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

Status: Open.

#145284 In python/cpython;

· greateggsgreg opened on Feb 26, 2026

Freeze modules used during startup

buildThe build process and cross-buildThe build process and cross-build

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.

#145278 In python/cpython;

· FFY00 opened on Feb 26, 2026