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Use new sentinel class for argparse.SUPPRESS

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#149149 In python/cpython;

· jonathandung opened on Apr 29, 2026

Update bundled pip to 26.1 to fix CVE-2026-3219 vulnerability

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

topic-ensurepip

type-featureA feature request or enhancementA feature request or enhancement

type-securityA security issueA security issue

Status: Open.

#149148 In python/cpython;

· vstinner opened on Apr 29, 2026

Segfault when cleaning up after a MemoryError with deeply nested objects

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.

#149146 In python/cpython;

· stestagg opened on Apr 29, 2026

CVE-2026-6019 fix does not handle non-ascii chars correctly

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

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

Status: Open.

#149144 In python/cpython;

· msmeissn opened on Apr 29, 2026

_decimal: mpd_context_t::status/traps mutated non-atomically leading to data race

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

topic-free-threading

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

Status: Open.

#149142 In python/cpython;

· devdanzin opened on Apr 29, 2026

_get_name_from_path() in Lib/unittest/loader.py fails when src path contains symlinks

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

Status: Open.

#149141 In python/cpython;

· neek78 opened on Apr 29, 2026

Incorrect handling of backslashes in RECORD file by importlib.metadata

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

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

Status: Open.

#149137 In python/cpython;

· markuspi opened on Apr 29, 2026

Standardize Windows proxy bypass (ProxyOverride) parsing to support wildcards and CIDR

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

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#149136 In python/cpython;

· Bais-Huang opened on Apr 29, 2026

Add module keyword argument to typing.TypeAliasType

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

topic-typing

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#149132 In python/cpython;

· ericmarkmartin opened on Apr 29, 2026

Error on build posixmodule.c in old Cygwin

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

OS-unsupported

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

Status: Open.

#149125 In python/cpython;

· TrueCat17 opened on Apr 29, 2026

When building with PGO in Cygwin, the gcov profiling library is missing

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.

#149124 In python/cpython;

· TrueCat17 opened on Apr 29, 2026

asyncio on Windows raises InvalidStateError after WinError 995

OS-windows

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

topic-asyncio

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

Status: Open.

#149123 In python/cpython;

· maxliaops opened on Apr 29, 2026