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zoneinfo: pure-Python parser accepts a POSIX TZ footer with no STD offset (C rejects)

Status: Open.

#152212 In python/cpython;

· tonghuaroot opened on Jun 25, 2026

CIFuzz fails on the 3.13 and 3.14 branches: plistlib parse and LookupError

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.

#152211 In python/cpython;

· vstinner opened on Jun 25, 2026

Pure-Python date.fromisoformat silently mis-parses malformed basic-format dates

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.

#152204 In python/cpython;

· tonghuaroot opened on Jun 25, 2026

Wrong oparg is passed to trace recorder when JUMP_BACKWARD_JIT is preceded by EXTENDED_ARG

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

topic-JIT

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

Status: Open.

#152192 In python/cpython;

· markshannon opened on Jun 25, 2026

test_zipfile64.[...].test_strip_removed_large_file_with_dd_no_sig fails on BigMem runs

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.

#152190 In python/cpython;

· StanFromIreland opened on Jun 25, 2026

library/itertools.rst declares chain as a function and chain.from_iterable as a class method immediately below, but refers to it as a function

docsDocumentation in the Doc dirDocumentation in the Doc dir

Status: Open.

#152172 In python/cpython;

· jonathandung opened on Jun 25, 2026

array.array.fromlist() exposes uninitialized memory when an element's __index__ resizes the array

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.

#152166 In python/cpython;

· iamsharduld opened on Jun 25, 2026

datetime/time.fromisoformat: C accelerator accepts an empty fraction before a timezone designator

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.

#152157 In python/cpython;

· tonghuaroot opened on Jun 25, 2026

Fix error handling in Modules/_interpchannelsmodule.c

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

topic-subinterpreters

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

Status: Open.

#152156 In python/cpython;

· sobolevn opened on Jun 25, 2026

base64: Replacing the old getopt with argparse in CLI

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.

#152150 In python/cpython;

· ByteFlowing1337 opened on Jun 25, 2026

Remove the commented-out lines concerning callable_iterator in _collections_abc.py

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

type-refactorCode refactoring (with no changes in behavior)Code refactoring (with no changes in behavior)

Status: Open.

#152148 In python/cpython;

· jonathandung opened on Jun 25, 2026

xml.dom.minidom: DOMBuilderFilter accept/reject is inverted for notation declarations

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

topic-XML

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

Status: Open.

#152142 In python/cpython;

· tonghuaroot opened on Jun 25, 2026