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xml.etree.ElementTree.Element crashes (SIGSEGV) under concurrent clear() and subscript access in free-threading builds

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

topic-free-threading

topic-XML

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

Status: Open.

#146022 In python/cpython;

· sampsonc opened on Mar 16, 2026

struct.Struct crashes (seg fault) under concurrent re-initialization and unpack in free-threading builds

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

topic-free-threading

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

Status: Open.

#146020 In python/cpython;

· sampsonc opened on Mar 16, 2026

Over-aggressive optimization for _GUARD_CODE_VERSION

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

Status: Open.

#146018 In python/cpython;

· markshannon opened on Mar 16, 2026

Add slash-less SIP URI support for urllib.parse.url{parse,split} (RFC 3261)

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

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#146014 In python/cpython;

· codingjoe opened on Mar 16, 2026

heap-use-after-free in signaldict_repr: signaldict outlives its parent Context after explicit del

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

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

Status: Open.

#146011 In python/cpython;

· YuanchengJiang opened on Mar 16, 2026

recent -X options do not auto-propagate to multiprocessing processes

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

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

topic-multiprocessing

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

Status: Open.

#146004 In python/cpython;

· gpshead opened on Mar 15, 2026

pyexpat.c: Unbounded C recursion in conv_content_model causes crash (CVE 2026-4224)

3.10only security fixesonly security fixes

3.11only security fixesonly security fixes

3.12only security fixesonly security fixes

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

topic-XML

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

type-securityA security issueA security issue

Status: Open.

#145986 In python/cpython;

· StanFromIreland opened on Mar 15, 2026

Support alternative alphabets in BaseXX encodings

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-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#145980 In python/cpython;

· serhiy-storchaka opened on Mar 15, 2026

_csv: _set_str() missing NULL check after PyUnicode_DecodeASCII()

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

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

Status: Open.

#145978 In python/cpython;

· raminfp opened on Mar 15, 2026

Clean up unused files from Misc/

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

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#145976 In python/cpython;

· StanFromIreland opened on Mar 15, 2026

Remote debugger should be checked only if interpreter paused on STW

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.

#145970 In python/cpython;

· sergey-miryanov opened on Mar 15, 2026

_csv: DIALECT_GETATTR macro silently masks non-AttributeError exceptions

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

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

Status: Open.

#145966 In python/cpython;

· raminfp opened on Mar 15, 2026