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importlib race condition allows stale module ref to escape on failure

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

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

topic-importlib

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

Status: Open.

#143650 In python/cpython;

· gpshead opened on Jan 10, 2026

Python/parking_lot.c:159:15: error: call to undeclared function 'sem_clockwait';

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

OS-unsupported

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

Status: Open.

#143640 In python/cpython;

· user-name-beta opened on Jan 10, 2026

Use-after-free in <code>_pickle.load_setitem</code> via re-entrant key <code>__hash__</code>

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

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

Status: Open.

#143639 In python/cpython;

· jackfromeast opened on Jan 10, 2026

Use-after-free in pickle BUILD via re-entrant <code>__setitem__</code>

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

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

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

Status: Open.

#143638 In python/cpython;

· jackfromeast opened on Jan 10, 2026

Heap out-of-bound read in <code>socket.sendmsg</code> ancillary parser after re-entrant <code>__index__</code> clears the control list

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.

#143637 In python/cpython;

· jackfromeast opened on Jan 10, 2026

Type confusion in <code>SimpleNamespace.__replace__</code> via re-entrant <code>__new__</code>

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.

#143636 In python/cpython;

· jackfromeast opened on Jan 10, 2026

Use-after-free in <code>_Py_typing_type_repr</code> via re-entrant <code>__origin__</code> lookup during <code>GenericAlias</code> repr

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

topic-typing

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

Status: Open.

#143635 In python/cpython;

· jackfromeast opened on Jan 10, 2026

_hmac module bypasses --with-builtin-hashlib-hashes by embedding all HACL hash implementations

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

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

pendingThe issue will be closed if no feedback is providedThe issue will be closed if no feedback is provided

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

Status: Open.

#143634 In python/cpython;

· stratakis opened on Jan 10, 2026

failure building Python 3.15.0a3 on Alpine

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

OS-unsupported

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

Status: Open.

#143632 In python/cpython;

· yosifkit opened on Jan 9, 2026

Optimize pathlib.PurePath.relative_to walk up case

performancePerformance or resource usagePerformance or resource usage

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

topic-pathlib

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#143630 In python/cpython;

· heikkitoivonen opened on Jan 9, 2026

Race condition in test_traceback_when_child_process_terminates_abruptly

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

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

Status: Open.

#143620 In python/cpython;

· a12k opened on Jan 9, 2026

Add highlighting and colour to the visualisation graph of executors.

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)

performancePerformance or resource usagePerformance or resource usage

topic-JIT

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#143613 In python/cpython;

· markshannon opened on Jan 9, 2026