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

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

• 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

• multiprocessing: on Windows, a message over 4,294,967,247 bytes raises OSError and breaks a waiting receiver

  python/cpython#161668 · opened on Nov 9, 2026
  2

• tkinter: os.dup2() on fds 1/2 breaks every subsequent Tcl interpreter on Windows

  python/cpython#161620 · opened on Nov 8, 2026
  3

• platform: import _wmi on first use

  python/cpython#161513 · opened on Nov 6, 2026
  1

• mimetypes: reading the Windows registry through HKEY_CLASSES_ROOT is slow

  python/cpython#161512 · opened on Nov 6, 2026
  4

• Windows: avoid importing encodings._win_cp_codecs and time at startup

  python/cpython#161510 · opened on Nov 6, 2026
  3

• tarfile: Windows same-drive drive-relative symlink not caught by data filter

  python/cpython#161323 · opened on Nov 4, 2026

• CYGWIN: Python-3.16.0a1 doesn't select correct strerror_r()

  python/cpython#161198 · opened on Nov 2, 2026

• winreg.ExpandEnvironmentStrings() passes the buffer size as the error code on failure

  python/cpython#161021 · opened on Oct 31, 2026

• sysconfig provide wrong path in built cpython on windows

  python/cpython#160905 · opened on Oct 29, 2026

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

  python/cpython#160699 · opened on Oct 26, 2026
  1

• Windows: remote pdb loses its interrupt connection after about 120 seconds

  python/cpython#160683 · opened on Oct 25, 2026
  4

• test_subprocess: test_getoutput fails on non-English Windows, as text mode decodes cmd.exe's OEM output as UTF-8

  python/cpython#160652 · opened on Oct 25, 2026
  3

• Windows: python.exe fails to start from a long path because of DLL manifests

  python/cpython#160624 · opened on Oct 24, 2026

• Add an opt-in Windows ARM64EC build configuration

  python/cpython#160395 · opened on Oct 22, 2026

• shutil.rmtree() cannot remove directory trees deeper than MAX_PATH on Windows

  python/cpython#159681 · opened on Oct 18, 2026

• os.truncate() ignores _chsize_s() errors on Windows

  python/cpython#159630 · opened on Oct 17, 2026

• Windows ARM64 tail-call interpreter: compiler and commit performance effects

  python/cpython#159521 · opened on Oct 16, 2026
  5

• PowerShell venv activation treats square brackets in paths as wildcards

  python/cpython#159498 · opened on Oct 15, 2026

• Windows: new REPL loops forever on OSError from getheightwidth when stdin is NUL and output is redirected

  python/cpython#159323 · opened on Oct 13, 2026
  3

• _winapi.CreateProcess audit event passes garbage for command_line

  python/cpython#159237 · opened on Oct 12, 2026
  1

• test_profile: ProfileTest.test_cprofile() failed on AMD64 Windows PGO Tailcall 3.x

  python/cpython#159117 · opened on Oct 10, 2026
  3

• Windows: import hashlib loads user32.dll and the GDI DLLs through libcrypto; delay-load user32

  python/cpython#159008 · opened on Oct 8, 2026
  3

• Windows cpXXX codecs: StreamReader raises TypeError (decode() missing 'final')

  python/cpython#158980 · opened on Oct 7, 2026