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Cpython v3.13.12

Cpython: v3.13.12 Release

Release date:
February 3, 2026
Previous version:
v3.13.11 (released December 5, 2025)
Magnitude:
1,131 Diff Delta
Contributors:
16 total committers
Data confidence:
Commits:
38 impacting commits

158 Features Released with v3.13.12

[3.13] gh-84232: Fix `pydoc` docs.python.org link generation (GH-139995)
#143099
[3.13] gh-142278: Add granular change detection for platforms in CI (GH-142350)
#142578
[3.13] gh-143572: Run 'python3-libraries' fuzzer in CI using CIFuzz (…
#143915
[3.13] gh-142571: Check for errors before calling each syscall in `PyUnstable_CopyPerfMapFile()` (GH-142460)
#142602
[3.13] gh-143377: fix crashes in `_interpreters.capture_exception` (GH-143418)
#143653
[3.13] gh-143189: fix insertdict() for non-Unicode key (GH-143285)
#143772
[3.13] gh-143309: fix UAF in `os.execve` when the environment is concurrently mutated (GH-143314)
#143431
[3.13] gh-140373: Correctly emit PY_UNWIND event when generator is closed (GH-140767)
#140821
[3.13] Bump GitHub Actions (GH-143757)
#143798
[3.13] gh-142776: Ensure fp file descriptor is closed on all code paths in import.c (GH-142777)
#142989
[3.13] gh-142557: fix UAF in `bytearray.__mod__` when object is mutated while formatting `%`-style arguments (GH-143213)
#143229
[3.13] gh-143195: fix UAF in `{bytearray,memoryview}.hex(sep)` via re-entrant `sep.__len__` (GH-143209)
#143220
gh-144194: Fix mmap failure check in perf_jit_trampoline.c
#143713
[3.13] Update pre-commit with zizmor and Ruff fixes (GH-143095) (GH-143102)
#143113
gh-140806: add docs for `enum.bin` function
#140807
[3.13] gh-144023: Prevent `follow_symlinks` from being allowed with an fd of 0 (GH-144022)
#144152
[3.13] gh-141794: Reduce size of compiler stress tests to fix Android warnings (GH-142263)
#142409
[3.13] gh-143925: Reject control characters in data: URL mediatypes
#144111
[3.13] gh-142451: correctly copy HMAC attributes in `HMAC.copy()` (GH-142510)
#142701
[3.13] Notify Sviat of GHA changes through codeowners (GH-143945)
#144052
[3.13] gh-141808: Don't remove the JIT stencils when building with PGO (GH-141809) (GH-142657)
#142955
[3.13] gh-143012: use `Py_ssize_t` cast for `PyBytes_FromStringAndSize` (GH-143013)
#143015
[3.13] gh-142527: Docs: Clarify that random.seed() discards the sign of an integer input (GH-142483)
#142971
[3.13] gh-142784: make the asyncio REPL call `loop.close()` at exit (GH-142785)
#142932
[3.13] GH-100964: Fix reference cycle in exhausted generator frames (G…
#142904
[3.13] gh-142766: Clear frame when `generator.close()` is called (gh-142838)
#142900
[3.13] gh-142876: remove reference to thread in documentation of `asyncio.Queue.shutdown` (GH-142888)
#142892
[3.13] decimal docs: specification link and examples (GH-128698)
#142805
[3.13] gh-142873: Do not check for `PyContextVar_CheckExact` twice in `PyContextVar_Set` (GH-142874)
#142894
[3.13] Fix os.posix_spawn() error handling (GH-142532)
#142581

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Top Contributors in v3.13.12

ZeroIntensity
cmaloney
jihugo
picnixz
StanFromIreland
sethmlarson
methane
efimov-mikhail
johnslavik
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