Issues

• compile: double free of pc->fail_pop in codegen_pattern_or on allocation failure with nested or-pattern

  interpreter-coretype-crash
  python/cpython#160789 · Filter by author waroad opened on Oct 27, 2026

• codeobject: == on code objects takes exponential time in scope nesting depth (30 nested classes still running after 120 s)

  interpreter-coreperformancetype-bug
  python/cpython#160788 · Filter by author waroad opened on Oct 27, 2026

• subprocess.run() can warn that a child is still running after killing it on Ctrl-C

  stdlibtopic-subprocesstype-bug
  python/cpython#160787 · Filter by author jelle-openai opened on Oct 27, 2026

• Backport venv activation scripts escaping improvements from virtualenv

  stdlibtopic-venvtype-bug
  python/cpython#160782 · Filter by author hroncok opened on Oct 27, 2026

• BytesIO and StringIO issues with large sizes

  3.143.153.16extension-modulesOS-linuxOS-windowstopic-IOtype-bug
  python/cpython#160781 · Filter by author cmaloney opened on Oct 27, 2026
  

• tarfile: extractfile(member).read() of a sparse member is slow due to repeated bytes concatenation

  performancestdlib
  python/cpython#160774 · Filter by author devdavidejesus opened on Oct 27, 2026

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

  interpreter-coretype-crash
  python/cpython#160773 · Filter by author charliermarsh opened on Oct 27, 2026

• Annotations: Nested generics containing forward references can evade evaluation in ForwardRef.evaluate

  3.143.153.16stdlibtopic-typingtype-bug
  python/cpython#160766 · Filter by author DavidCEllis opened on Oct 27, 2026
  

• TypeError when pickling directly instantiated urllib.parse result objects

  stdlibtype-bug
  python/cpython#160761 · Filter by author austinaviv opened on Oct 27, 2026

• asyncio: run newly scheduled callbacks eagerly before polling for I/O

  topic-asynciotype-feature
  python/cpython#160760 · Filter by author asvetlov opened on Oct 27, 2026
  1

• documentation of tp_alloc and tp_free inheritance for heap types is incorrect

  docstopic-C-API
  python/cpython#160749 · Filter by author davidhewitt opened on Oct 27, 2026

• ssl: test_distrusted_spki fails on AWS-LC builds

  teststopic-SSLtype-bug
  python/cpython#160736 · Filter by author torben-hansen opened on Oct 26, 2026
  1

• Tachyon: GeckoCollector closes open markers too early when replay batches arrive out of order

  stdlibtopic-profilingtype-bug
  python/cpython#160735 · Filter by author ivonastojanovic opened on Oct 26, 2026
  

• venv: --prompt / env-dir value is not escaped for the shell's prompt-display pass in generated activate (bash/zsh)

  stdlibtopic-venvtype-bug
  python/cpython#160732 · Filter by author apocalypse-agent opened on Oct 26, 2026
  5

• Speed up print() by looking up file.write once per call

  interpreter-coreperformancetopic-IOtype-feature
  python/cpython#160725 · Filter by author cmaloney opened on Oct 26, 2026
  

• Add list.discard() and deque.discard()

  interpreter-coretype-feature
  python/cpython#160724 · Filter by author StanFromIreland opened on Oct 26, 2026
  15

  

• New _Py_STDC_VERSION macro not available in pyport.h

  topic-C-APItype-bug
  python/cpython#160719 · Filter by author fuhsnn opened on Oct 26, 2026

• tarfile filter bypass: euc_kr make-up sequences let realpath() and the kernel disagree, writing files outside the destination

  3.113.123.133.143.153.16extension-modulestype-security
  python/cpython#160717 · Filter by author StanFromIreland opened on Oct 26, 2026
  

• ctypes: out-of-bounds read/write in bool() and argument passing after resize()

  extension-modulestopic-ctypestype-crash
  python/cpython#160708 · Filter by author DmitryTD opened on Oct 26, 2026

• Build fails with glibc 2.13 after static_assert fallback regression

  buildtype-bug
  python/cpython#160704 · Filter by author ZhongRuoyu opened on Oct 26, 2026

• subprocess.run(timeout=...) swallows a signal handler's InterruptedError on macOS in Python 3.15

  OS-macstdlibtopic-subprocesstype-bug
  python/cpython#160700 · Filter by author nick-inkeep opened on Oct 26, 2026

• sqlite3: concurrent execute() on a shared Connection crashes the process with a native access violation (threadsafety == 3)

  extension-modulesOS-windowstopic-sqlite3type-crash
  python/cpython#160699 · Filter by author BlueDestination opened on Oct 26, 2026
  1

• Free-threaded build crashes when destructor ran in the middle of dict/list resize

  3.143.153.16interpreter-coretopic-free-threadingtype-crash
  python/cpython#160697 · Filter by author Eclips4 opened on Oct 26, 2026

• Speed up urllib.parse.unquote() for ASCII input

  performancestdlibtype-feature
  python/cpython#160690 · Filter by author f4hy opened on Oct 26, 2026

• Add C API tests for PyObject_CopyData and PyBuffer_FillContiguousStrides

  teststopic-C-API
  python/cpython#160688 · Filter by author Davien21 opened on Oct 26, 2026