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3.14 is missing a bytecode line number for one-line conditionals

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

Status: Open.

#136190 In python/cpython;

· nedbat opened on Jul 1, 2025

The JIT's "pure" <code>_BINARY_OP</code> evaluation produces UB (and incorrect results)

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)

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.

#136183 In python/cpython;

· brandtbucher opened on Jul 1, 2025

JIT global-to-constant promotion doesn't properly validate the globals dictionary at runtime

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)

topic-JIT

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

Status: Open.

#136154 In python/cpython;

· brandtbucher opened on Jun 30, 2025

Possible resource exhaustation of <code>expandvars</code> in <code>Tools/freeze/checkextensions.py</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

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

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

Status: Open.

#136073 In python/cpython;

· kexinoh opened on Jun 28, 2025

Potential Quadratic Complexity Vulnerabilities in <code>path</code> Modules

3.10only security fixesonly security fixes

3.11only security fixesonly security fixes

3.12only security fixesonly security fixes

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

3.9only security fixesonly security fixes

stdlibPython modules in the Lib dirPython modules in the Lib dir

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

type-securityA security issueA security issue

Status: Open.

#136065 In python/cpython;

· kexinoh opened on Jun 28, 2025

Potential Quadratic Complexity Vulnerabilities in the <code>email</code> Module

3.10only security fixesonly security fixes

3.11only security fixesonly security fixes

3.12only security fixesonly security fixes

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

3.9only security fixesonly security fixes

stdlibPython modules in the Lib dirPython modules in the Lib dir

topic-email

type-securityA security issueA security issue

Status: Open.

#136063 In python/cpython;

· kexinoh opened on Jun 28, 2025

Add a Section to the Language Reference About Runtime Components

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

docsDocumentation in the Doc dirDocumentation in the Doc dir

Status: Open.

#135944 In python/cpython;

· ericsnowcurrently opened on Jun 25, 2025

Non-blocking <code>_PyMutex_LockTimed</code> spins and may fail unnecessarily in no-GIL builds

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)

topic-free-threading

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

Status: Open.

#135871 In python/cpython;

· jtibbertsma opened on Jun 24, 2025

<code>umask</code>ed <code>os.makedirs()</code> sometimes fails on Emscripten

3.14bugs and security fixesbugs and security fixes

3.15new features, bugs and security fixesnew features, bugs and security fixes

OS-emscripten

stdlibPython modules in the Lib dirPython modules in the Lib dir

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

Status: Open.

#135783 In python/cpython;

· freakboy3742 opened on Jun 21, 2025

Extraneous error output when process exits after using subinterpreters

3.14bugs and security fixesbugs and security fixes

3.15new features, bugs and security fixesnew features, bugs and security fixes

stdlibPython modules in the Lib dirPython modules in the Lib dir

topic-subinterpreters

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

Status: Open.

#135729 In python/cpython;

· a-reich opened on Jun 19, 2025

Regression in multiprocessing.set_start_method introduced in Python 3.13.4

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

stdlibPython modules in the Lib dirPython modules in the Lib dir

topic-multiprocessing

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

Status: Open.

#135726 In python/cpython;

· marcelotduarte opened on Jun 19, 2025

HTMLParser differences from the HTML5 specification

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

stdlibPython modules in the Lib dirPython modules in the Lib dir

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

Status: Open.

#135661 In python/cpython;

· serhiy-storchaka opened on Jun 18, 2025