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Incorrect calculation of indentation width in case of mixed tabs and spaces in plistlib

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

OS-mac

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.

#143346 In python/cpython;

· serhiy-storchaka opened on Jan 2, 2026

<code>ctypes.CDLL</code> does no longer honor the <code>handle</code> argument starting Python 3.13.10+ &amp; 3.14.1+?

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-ctypes

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

Status: Open.

#143304 In python/cpython;

· leofang opened on Dec 31, 2025

Overlapped I/O leaks buffers when operation fails to start

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

OS-windows

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

Status: Open.

#143249 In python/cpython;

· hyongtao-code opened on Dec 28, 2025

logging.handler fails when attempting to rotate a fifo (with potential fix)

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

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

Status: Open.

#143237 In python/cpython;

· rubiksdot opened on Dec 28, 2025

<code>SystemExit</code> raised by <code>PYTHONSTARTUP</code> can prevent the REPL from starting

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

topic-replRelated to the interactive shellRelated to the interactive shell

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

Status: Open.

#143023 In python/cpython;

· johnslavik opened on Dec 20, 2025

Type confusion in <code>float_richcompare</code> via re-entrant <code>__neg__</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

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

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

Status: Open.

#143006 In python/cpython;

· jackfromeast opened on Dec 20, 2025

Global buffer overflow in <code>bytearray_extend</code> via misleading <code>__length_hint__</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

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

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

Status: Open.

#143003 In python/cpython;

· jackfromeast opened on Dec 20, 2025

The new REPL floods the output when stdout is a broken pipe

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-replRelated to the interactive shellRelated to the interactive shell

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

Status: Open.

#142948 In python/cpython;

· johnslavik opened on Dec 18, 2025

atexit.unregister() can remove wrong callback

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

Status: Open.

#142881 In python/cpython;

· serhiy-storchaka opened on Dec 17, 2025

thread-safety issue in pure-Python <code>zoneinfo</code> cache on 3.13t

3.13bugs and security fixesbugs and security fixes

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

topic-free-threading

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

Status: Open.

#142763 In python/cpython;

· ariebovenberg opened on Dec 15, 2025

Regression due to removal of quadratic behavior in node ID cache clearing (GH-142145)

3.13bugs and security fixesbugs and security fixes

3.14bugs and security fixesbugs and security fixes

release-blocker

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.

#142754 In python/cpython;

· stefanor opened on Dec 15, 2025

Crash <code>msgspec</code> with Python 3.13.*

3.13bugs and security fixesbugs and security fixes

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

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

topic-C-API

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

Status: Open.

#142671 In python/cpython;

· shadchin opened on Dec 13, 2025