Issues

• Update dict() to use the existing freelist

  interpreter-coreperformancetype-feature
  python/cpython#160913 · by Filter by author eendebakpt was closed on Oct 30, 2026

• Update list() to use the existing freelist

  interpreter-coreperformancetype-feature
  python/cpython#160858 · by Filter by author cmaloney was closed on Oct 29, 2026
  

• Pure-Python datetime.fromisoformat() accepts a trailing date-time separator

  type-bug
  python/cpython#160850 · by Filter by author Krish0703-irl was closed on Oct 28, 2026

• Pure-Python timedelta loses precision with large float arguments

  stdlibtype-bug
  python/cpython#160806 · by Filter by author canblmz1 was closed on Oct 29, 2026

• Add support for generator based awaitables to asyncio introspection

  stdlibtopic-asynciotype-feature
  python/cpython#160804 · by Filter by author kumaraditya303 was closed on Oct 28, 2026

• BytesIO and StringIO issues with large sizes

  3.143.153.16extension-modulesOS-linuxOS-windowstopic-IOtype-bug
  python/cpython#160781 · by Filter by author cmaloney was closed on Oct 29, 2026
  4

  

• Use-after-free in OSError.__str__ when a formatting callback clears filename

  interpreter-coretype-crash
  python/cpython#160773 · by Filter by author charliermarsh was closed on Oct 29, 2026

• [3.13] Backport request: gh-143923 poplib control-character rejection (CVE-2025-15367)

  3.133.14stdlibtype-security
  python/cpython#160731 · by Filter by author w4ffl35 was closed on Oct 26, 2026
  2

• Build fails with glibc 2.13 after static_assert fallback regression

  buildtype-bug
  python/cpython#160704 · by Filter by author ZhongRuoyu was closed on Oct 28, 2026
  1

• Builtin modules can't depend on build-helper output because _freeze_module links every static module

  buildtype-feature
  python/cpython#160689 · by Filter by author itamaro was closed on Oct 26, 2026
  

• free-threading GC does not properly track references to a running function

  interpreter-coretopic-free-threadingtype-bug
  python/cpython#160682 · by Filter by author johng was closed on Oct 26, 2026
  1

• Combining the argument-conversion loops in _PyEval_Vector

  interpreter-coreperformancetype-feature
  python/cpython#160679 · by Filter by author ashm-dev was closed on Oct 29, 2026
  5

• test_except_star does not cover except* handlers raising a non-Exception BaseException

  tests
  python/cpython#160659 · by Filter by author agronholm was closed on Oct 26, 2026

• test_gdb.test_jit.test_bt_unwinds_from_inside_jit_executor fails on aarch64 with gdb 17.1 (Ubuntu 26.04 toolchain)

  type-bug
  python/cpython#160631 · by Filter by author sendaoYan was closed on Oct 25, 2026
  1

• Incorrectly formatted error message in asyncio.proactor_events.sendto()

  stdlibtopic-asynciotype-bug
  python/cpython#160596 · by Filter by author aisk was closed on Oct 26, 2026

• Py_Initialize() in a background thread crashes on free-threaded release builds of 3.14 after the mimalloc 2.5.2 update

  interpreter-coretopic-free-threadingtype-crash
  python/cpython#160588 · by Filter by author devdavidejesus was closed on Oct 24, 2026

• pprint.pp doesn't document the addition of expand

  docsstdlib
  python/cpython#160586 · by Filter by author nineteendo was closed on Oct 24, 2026
  3

• socket.fromfd() leaks the dup()'d fd when family/type/proto are invalid

  topic-sockettype-bug
  python/cpython#160561 · by Filter by author 0x-bala was closed on Oct 27, 2026
  7

• Crash when a multi-threaded ZstdCompressor with a ZstdDict is freed while compressing

  extension-modulestype-crash
  python/cpython#160549 · by Filter by author gpshead was closed on Oct 25, 2026
  

• Outdated details in Mac/README.rst and Mac/BuildScript/README.rst

  python/cpython#160547 · by Filter by author devdavidejesus was closed on Oct 24, 2026
  1

• Crash when the GC collects a multi-threaded ZstdCompressor together with its ZstdDict

  extension-modulestype-crash
  python/cpython#160535 · by Filter by author gpshead was closed on Oct 25, 2026
  

• trace does not generate cover file

  type-bug
  python/cpython#160524 · by Filter by author mindentropy was closed on Oct 23, 2026
  1

• asyncio SSL transport ignores ssl_shutdown_timeout after the peer sends EOF

  stdlibtopic-asynciotopic-SSLtype-bug
  python/cpython#160520 · by Filter by author gpshead was closed on Oct 25, 2026
  

• start_tls() does not call connection_lost() when the handshake is aborted

  topic-asynciotype-bug
  python/cpython#160513 · by Filter by author gpshead was closed on Oct 25, 2026
  

• asyncio TLS server memory grows without bound for a peer that stops reading

  topic-asynciotype-security
  python/cpython#160499 · by Filter by author gpshead was closed on Oct 29, 2026
  1