Issues

• _interpreters xibufferview_getbuf missing INCREF: shared-memoryview UAF

  3.143.153.16extension-modulestopic-subinterpreterstype-crash
  python/cpython#158923 · Filter by author error-3317 opened on Oct 6, 2026

• Excessive stack use in _PyModule_IsPossiblyShadowing

  interpreter-coretype-bug
  python/cpython#158918 · Filter by author Yhg1s opened on Oct 6, 2026
  

• "open" audit event "mode" does not contain information for os.open calls

  extension-modulestype-bug
  python/cpython#158916 · Filter by author johnkw opened on Oct 6, 2026
  2

• Wrong NotImplementedError documentation regarding abstract base classes

  docspending
  python/cpython#158911 · Filter by author clauspruefer opened on Oct 6, 2026
  1

• Direct HTTP 407 can receive HTTPS-scoped credentials

  3.113.123.133.143.153.16stdlibtype-security
  python/cpython#158907 · Filter by author bupt-Yy-young opened on Oct 6, 2026

• Race condition leads to AttributeError from BaseEventLoop.__del__

  stdlibtopic-asynciotype-bug
  python/cpython#158903 · Filter by author bmerry opened on Oct 6, 2026

• Potential async-signal-safety issue in asyncio.Runner._on_sigint

  stdlibtopic-asynciotype-bug
  python/cpython#158902 · Filter by author bmerry opened on Oct 6, 2026

• Free-threading scalability issue: contended PyMutex collapses with a few tens of threads (fair handoff)

  performancetopic-free-threading
  python/cpython#158901 · Filter by author cakedev0 opened on Oct 6, 2026
  1

• Optimize dict insertion and deletion by avoiding a second probe

  interpreter-coreperformancetype-feature
  python/cpython#158898 · Filter by author hetaozdh opened on Oct 6, 2026

• Performance regression in BufferedReader.readline() after switching to PyBytesWriter

  extension-modulesperformance
  python/cpython#158897 · Filter by author leandrodamascena opened on Oct 6, 2026

• Improve regrtest integration with Github UI for test failures

  infrateststype-feature
  python/cpython#158895 · Filter by author cmaloney opened on Oct 6, 2026
  

• Calling os.strerror() in parallel is not thread safe on FreeBSD

  OS-freebsdtopic-unicode
  python/cpython#158893 · Filter by author vstinner opened on Oct 6, 2026
  10

• test_codecs: LocaleCodecTest fails with some locales on FreeBSD if UTF-8 Mode is disabled

  teststopic-unicode
  python/cpython#158890 · Filter by author vstinner opened on Oct 6, 2026

• Unlimited loop on trying to import the module of the filesystem encoding if iconv() is used

  teststopic-unicode
  python/cpython#158889 · Filter by author vstinner opened on Oct 6, 2026
  4

• test_codecs: IconvTest.test_encode_shift_state_flush() does crash on FreeBSD15

  OS-freebsdteststopic-unicode
  python/cpython#158888 · Filter by author vstinner opened on Oct 6, 2026
  1

• [C API] Add all macros to Misc/stable_abi.toml

  topic-C-API
  python/cpython#158886 · Filter by author vstinner opened on Oct 5, 2026
  6

• Docs: search, index, and download pages lack Previous/Next navigation and sidebar actions

  docs
  python/cpython#158884 · Filter by author m-aciek opened on Oct 5, 2026
  

• test_socket: ThreadedVSOCKSocketStreamTest.testStream errors on a VSOCK guest whose transport reports ENODEV

  topic-sockettype-bug
  python/cpython#158883 · Filter by author rudi193-cmd opened on Oct 5, 2026

• python -m asyncio ps shows tasks from only one interpreter

  stdlibtopic-asynciotopic-subinterpreterstype-bug
  python/cpython#158880 · Filter by author deadlovelll opened on Oct 5, 2026

• Drop setting Modules/Setup.local for WASI

  buildOS-wasi
  python/cpython#158878 · Filter by author brettcannon opened on Oct 5, 2026
  

• Upgrade bundled Expat to 2.9.0 (e.g. for fixes to two vulnerabilities)

  3.113.123.133.143.153.16extension-modulestopic-XMLtype-security
  python/cpython#158876 · Filter by author hartwork opened on Oct 5, 2026
  

• xml.dom.minidom: Node.normalize() is quadratic in the number of adjacent text nodes

  performancestdlibtopic-XMLtype-feature
  python/cpython#158860 · Filter by author jonbaldie opened on Oct 5, 2026

• tarfile stream writes get slower as copybufsize grows

  performancestdlibtype-bug
  python/cpython#158858 · Filter by author jonbaldie opened on Oct 5, 2026

• Enum creation is quadratic in the number of members (_hashable_values_ list scan)

  performancestdlibtype-bug
  python/cpython#158856 · Filter by author jonbaldie opened on Oct 5, 2026

• pegen: leader selection for left-recursive SCCs takes factorial time

  interpreter-coreperformancetopic-parsertype-bug
  python/cpython#158847 · Filter by author jonbaldie opened on Oct 5, 2026