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Issues

• Short, frequent GIL releases block other threads for seconds

  python/cpython#161868 · opened on Nov 12, 2026

• Possible NULL-related SystemError when interpreter is not fully initialized

  python/cpython#161863 · opened on Nov 12, 2026

• http client putrequest changes active continue timeout after rejected call

  python/cpython#161861 · opened on Nov 12, 2026

• macOS "Hide" handled improperly in tkinter with Tk >= 9.0

  python/cpython#161848 · opened on Nov 12, 2026

• _interpchannels: ChannelID.__eq__ reads module state from sys.modules without a check

  python/cpython#161841 · opened on Nov 12, 2026
  3

• ctypes: array slice assignment replaces the value's __len__ exception with a ValueError

  python/cpython#161840 · opened on Nov 12, 2026

• sqlite3: exception from a collation callback is replaced by SystemError

  python/cpython#161837 · opened on Nov 12, 2026

• Building with LTO and Clang 20 on Debian fails to link

  python/cpython#161821 · opened on Nov 11, 2026

• Improper handling of Unicode Properties in character set 3.16a2

  python/cpython#161814 · opened on Nov 11, 2026

• gh-161735: Update zlib-ng to 2.2.5 on Windows

  Unread
  #161813· opened Nov 11, 2026 · Updated Nov 12, 2026
  4

• ElementTree: itertext() and tostring(method="text") lose the text of elements whose tag is a QName

  python/cpython#161809 · opened on Nov 11, 2026
  1

• ElementTree: invalid paths raise KeyError instead of SyntaxError, and C and Python disagree on them

  python/cpython#161808 · opened on Nov 11, 2026
  1

• ElementTree: empty path makes find()/findall()/findtext() raise TypeError

  python/cpython#161807 · opened on Nov 11, 2026
  1

• ARCHFLAGS does not properly override ‑arch in sysconfig.get_config_vars() values since Python 3.13

  python/cpython#161805 · opened on Nov 11, 2026
  2

• gh-128942: Make array.array thread-safe in the free-threaded build

  Unread
  #161787· opened Nov 10, 2026 · Updated Nov 11, 2026
  1

• Emscripten build fails when WebAssembly reference types are disabled

  python/cpython#161782 · opened on Nov 10, 2026

• Release free-threaded thread-state attachment can clobber errno and cause spurious directory I/O EAGAIN

  python/cpython#161769 · opened on Nov 10, 2026

• asyncio.as_completed() leaves stale awaited_by edges when the loop exits early

  python/cpython#161766 · opened on Nov 10, 2026
  1

• ValueError: [Provider routines] invalid salt length in test_hashlibtest_pbkdf2_hmac_c on FIPS w/ OpenSSL 4.0.3

  python/cpython#161739 · opened on Nov 10, 2026
  8

• Windows: update zlib-ng to 2.2.5 (PGO builds with Visual Studio 17.11 decompress wrongly on AVX-512 CPUs)

  python/cpython#161735 · opened on Nov 10, 2026
  1

• compression.zstd.open() names the wrong mode in its invalid mode error

  python/cpython#161730 · opened on Nov 10, 2026

• Free-threading race betwen two Py_SETREF

  python/cpython#161714 · opened on Nov 9, 2026
  2

• Thread.join(timeout) can block forever: ThreadHandle_join reads the clock twice through Py_MAX (3.13, 3.14)

  python/cpython#161712 · opened on Nov 9, 2026
  1

• dict.fromkeys() GC-tracks a non-GC object returned by a subclass constructor (3.15 regression)

  python/cpython#161690 · opened on Nov 9, 2026
  2

• ElementTree slice assignment with start greater than stop duplicates a child without owning its second reference

  python/cpython#161689 · opened on Nov 9, 2026