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Data races in OpenSSL bindings

topic-SSL

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

Status: Open.

#143756 In python/cpython;

· colesbury opened on Jan 12, 2026

<code>tkinter</code> source and docs use the word 'slave'

docsDocumentation in the Doc dirDocumentation in the Doc dir

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

topic-tkinter

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

Status: Open.

#143754 In python/cpython;

· i-make-data-sexy opened on Jan 12, 2026

Use OpenSSL instrumented with TSan for TSan tests

testsTests in the Lib/test dirTests in the Lib/test dir

topic-SSL

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#143750 In python/cpython;

· colesbury opened on Jan 12, 2026

Add C API equivalent for <code>sys._is_gil_enabled()</code>

topic-C-API

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#143747 In python/cpython;

· devinrsmith opened on Jan 12, 2026

Bug in PyObject_CopyData leads to incorrect data copying order

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

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

Status: Open.

#143737 In python/cpython;

· buxingtan opened on Jan 12, 2026

Broader specialization in the Specializing Adaptive Interpreter for better JIT performance

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)

performancePerformance or resource usagePerformance or resource usage

Status: Open.

#143732 In python/cpython;

· markshannon opened on Jan 12, 2026

Issues in asyncio documentation section "A homemade asyncio.sleep"

docsDocumentation in the Doc dirDocumentation in the Doc dir

topic-asyncio

Status: Open.

#143727 In python/cpython;

· padoremu opened on Jan 12, 2026

Refcount elimination and redundant push/pops pass needs fixing to work together

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

performancePerformance or resource usagePerformance or resource usage

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#143723 In python/cpython;

· Fidget-Spinner opened on Jan 12, 2026

Make struct.Struct() really immutable

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.

#143715 In python/cpython;

· skirpichev opened on Jan 12, 2026

email package: UnicodeEncodeError in as_bytes() when folding malformed Subject header mixing raw UTF‑8 and encoded‑words

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

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

topic-email

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#143712 In python/cpython;

· DRSpalding opened on Jan 11, 2026

<code>sys.argv</code> no longer correct during main module execution using <code>forkserver</code>

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.

#143706 In python/cpython;

· tpwrules opened on Jan 11, 2026

Document secrets.DEFAULT_ENTROPY as an opaque value

docsDocumentation in the Doc dirDocumentation in the Doc dir

Status: Open.

#143700 In python/cpython;

· viccie30 opened on Jan 11, 2026