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Make the JIT optimizer buffer add to a new buffer, not in-place

topic-JIT

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#143421 In python/cpython;

·Fidget-Spinner openedon Jan 4, 2026

Indicate that <code>[array,list].insert</code> clamps the insertion index

docsDocumentation in the Doc dirDocumentation in the Doc dir

Status: Open.

#143420 In python/cpython;

·yousef-fadli openedon Jan 4, 2026

JIT: Implement <code>unique reference tracking</code> in Tier 2 for reference count optimizations

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

topic-JIT

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#143414 In python/cpython;

·cocolato openedon Jan 4, 2026

test_pyrepl failure on main

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

testsTests in the Lib/test dirTests in the Lib/test 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.

#143394 In python/cpython;

·smontanaro openedon Jan 3, 2026

Regression: importlib.metadata.PathDistribution.requires raises AttributeError, name/version raises TypeError

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.

#143387 In python/cpython;

·hroncok openedon Jan 3, 2026

Use-after-free in <code>s_pack_internal</code> via re-entrant <code>__bool__</code>

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.

#143379 In python/cpython;

·jackfromeast openedon Jan 3, 2026

Use-after-free in <code>_io.BytesIO.writelines</code> via re-entrant <code>__buffer__</code> close

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

topic-IO

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

Status: Open.

#143378 In python/cpython;

·jackfromeast openedon Jan 3, 2026

Heap buffer overflow in <code>_format_TracebackException</code> when <code>TracebackException.format</code> omits newline

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

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.

#143377 In python/cpython;

·jackfromeast openedon Jan 3, 2026

Type confusion in <code>_channelid_shared</code> via unvalidated <code>_id</code> attribute

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.

#143376 In python/cpython;

·jackfromeast openedon Jan 3, 2026

Null pointer dereference in <code>BufferedWriter.seek</code> during re-entrant close

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-IO

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

Status: Open.

#143375 In python/cpython;

·jackfromeast openedon Jan 3, 2026

JIT: Assertion <code>exc &amp;&amp; PyExceptionInstance_Check(exc)</code> failed in <code>*_PyEval_EvalFrameDefault</code>

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

topic-JIT

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

Status: Open.

#143358 In python/cpython;

·devdanzin openedon Jan 2, 2026

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 openedon Jan 2, 2026