Issues

• 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

• 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
  

• struct: non-ASCII bytes format raises UnicodeEncodeError instead of struct.error on 3.13/3.14

  3.133.14interpreter-coretype-bug
  python/cpython#158172 · Filter by author corona10 opened on Sep 25, 2026
  2

• pickle.dumps() creates and discards an AttributeError on every call since 3.13.1

  3.133.143.153.16extension-modulestype-bug
  python/cpython#158126 · Filter by author ashm-dev opened on Sep 24, 2026
  2

• IDLE on macOS 27 hangs when a menu command opens a dialog

  3.133.143.153.16OS-mactopic-tkintertype-bug
  python/cpython#158053 · Filter by author Universe-Of-The-Creator opened on Sep 24, 2026
  23

• CPython 3.13-3.15 concurrency and memory-safety issue reports

  3.133.143.15extension-modulesinterpreter-corependingtopic-free-threadingtype-bug
  python/cpython#157601 · Filter by author BaihongChen opened on Sep 16, 2026
  2

• Proxy-Authorization headers are preserved on redirects

  3.10 (EOL)3.113.123.133.143.153.16stdlibtype-security
  python/cpython#157583 · Filter by author sethmlarson opened on Sep 15, 2026

• Race condition in the cleanup of tempfile.TemporaryDirectory

  3.10 (EOL)3.113.123.133.143.16stdlibtype-security
  python/cpython#157579 · Filter by author StanFromIreland opened on Sep 15, 2026
  3

  

• Structseq objects created with PyStructSequence_New() are not tracked by the GC

  3.133.143.153.16interpreter-coretype-bug
  python/cpython#157443 · Filter by author serhiy-storchaka opened on Sep 13, 2026

• tarfile data/tar filter bypass via hard link to a symlink

  3.10 (EOL)3.113.123.13stdlibtype-security
  python/cpython#157190 · Filter by author StanFromIreland opened on Sep 8, 2026
  

• warn_explicit() discards the source line obtained from module_globals

  3.133.143.153.16extension-modulestype-bug
  python/cpython#155319 · Filter by author serhiy-storchaka opened on Aug 7, 2026

• stringprep and IDNA 2003 incorrectly handles some characters

  3.10 (EOL)3.113.123.133.143.153.16stdlibtopic-unicodetype-security
  python/cpython#155292 · Filter by author sethmlarson opened on Aug 6, 2026
  

• Windows code page codec cannot encode with code pages that require dwFlags=0

  3.133.143.153.16OS-windowstopic-unicodetype-bug
  python/cpython#155016 · Filter by author serhiy-storchaka opened on Aug 1, 2026

• macOS: Test availability for dup3() and pipe2() to prevent crashes when building against Xcode 27

  3.133.143.153.16extension-modulesOS-iosOS-mactype-crash
  python/cpython#153711 · Filter by author mrpippy opened on Jul 14, 2026
  4

• zipimport.zipimporter raises UnicodeDecodeError instead of ZipImportError for an invalid UTF-8 file name

  3.133.143.153.16stdlibtype-bug
  python/cpython#153679 · Filter by author tonghuaroot opened on Jul 14, 2026

• xml.dom.minidom: DOMBuilderFilter accept/reject is inverted for notation declarations

  3.133.143.153.16stdlibtopic-XMLtype-bug
  python/cpython#152142 · Filter by author tonghuaroot opened on Jun 25, 2026
  1

• marshal.dumps() crashes when an item's __buffer__ concurrently mutates the container

  3.133.143.153.16interpreter-coretype-bug
  python/cpython#151370 · Filter by author tonghuaroot opened on Jun 11, 2026

• mock.mock_open __exit__ called as instance method from contextlib.ExitStack context

  3.133.14stdlibtype-bug
  python/cpython#150484 · Filter by author clarker0 opened on May 26, 2026
  2

• sqlite3: Blob crashes when using a negative-step slice

  3.133.143.153.16extension-modulestopic-sqlite3type-bugtype-feature
  python/cpython#150449 · Filter by author ever0de opened on May 26, 2026
  7

• Reading gzip file with very long filename or comment takes long time

  3.133.143.15performancestdlibtype-bug
  python/cpython#150144 · Filter by author serhiy-storchaka opened on May 20, 2026
  2

• Issues in ipaddress.collapse_addresses()

  3.133.143.153.16stdlibtype-bugtype-feature
  python/cpython#149722 · Filter by author serhiy-storchaka opened on May 12, 2026

• OSError: AF_UNIX path too long regression in forkserver

  3.133.143.15stdlibtopic-multiprocessingtype-bug
  python/cpython#149527 · Filter by author mgorny opened on May 8, 2026
  4

  

• Reference leak in code object with reference loop

  3.133.143.15interpreter-coretype-bug
  python/cpython#148722 · Filter by author serhiy-storchaka opened on Apr 18, 2026
  3

• ssl.SSLSocket.read() / write() missing ERR_clear_error() before SSL_read_ex() / SSL_write_ex() causes spurious errors with cooperative threading

  3.10 (EOL)3.113.123.133.143.15extension-modulestopic-SSLtype-bugtype-security
  python/cpython#148594 · Filter by author kswia opened on Apr 15, 2026
  7

• py -V:X.Y script.py fails with "No suitable Python runtime found" when script arguments contain forward slashes

  3.133.143.15interpreter-coreOS-windows
  python/cpython#148478 · Filter by author xyzzy-foo opened on Apr 13, 2026
  2