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Cpython v3.13.13

Cpython: v3.13.13 Release

Release date:
April 7, 2026
Previous version:
v3.13.12 (released February 3, 2026)
Magnitude:
2,520 Diff Delta
Contributors:
19 total committers
Data confidence:
Commits:
102 impacting commits

142 Features Released with v3.13.13

[3.13] gh-144156: Fix email header folding concatenating encoded words (GH-144692)
#145195
[3.13] gh-146450: Normalise feature set of Android build script with other platform build scripts (GH-146451)
#148066
gh-143050: correct PyLong_FromString() to use _PyLong_Negate()
#145901
GH-146128: Remove the buggy AArch64 "33rx" relocation
#146263
[3.13] gh-144475: Fix reference management in partial_repr (GH-145362)
#145882
[3.13] gh-145599, CVE 2026-3644: Reject control characters in `http.cookies.Morsel.update()` (GH-145600)
#146024
gh-145349: Do not install `ccache`
#145350
[3.13] gh-144984: Fix crash in Expat's `ExternalEntityParserCreate` error paths (GH-144992)
#146142
[3.13] gh-146488: hash-pin all action references (gh-146489)
#147981
gh-146480: Override the exception in _PyErr_SetKeyError()
#146486
[3.13] gh-146250: Fix memory leak in re-initialization of `SyntaxError` (GH-146251)
#146519
[3.13] gh-142352: Fix asyncio start_tls() to transfer buffered data from StreamReader (GH-142354)
#145364
gh-145633: Fix struct.pack('f') on s390x
#146422
[3.13] gh-138891: fix star-unpack in get_annotations (GH-138951)
#146491
[3.13] gh-146059: Call fast_save_leave() in pickle save_frozenset() (GH-146173)
#146474
[3.13] gh-146310: Fix ensurepip to treat empty WHEEL_PKG_DIR as unset (GH-146357)
#146535
[3.13] gh-146080: fix a crash in SNI callbacks when the SSL object is gone (GH-146573)
#146598
[3.13] `compute-changes.py`: Fix & test `process_changed_files()` (GH-144674)
#145014
[3.13] gh-144759: Fix undefined behavior from NULL pointer arithmetic in lexer (GH-144788)
#145355
[3.13] gh-145098: Run Apple Silicon macOS CI on macos-26 (Tahoe) (GH-145099) (GH-146412)
#146414
[3.13] gh-144872: fix heap buffer overflow `_PyTokenizer_ensure_utf8` (GH-144807)
#145441
[3.13] gh-140814: Fix freeze_support() setting start method as side effect (GH-144608)
#146009
Add `permissions: {}` to all reusable workflows
#148114
[3.13] gh-143698: correctly check `scheduler` and `setpgroup` values for `os.posix_spawn[p]` (GH-143699)
#145074
[3.13] Docs: Standardize documentation authors (GH-148102)
#148106
[3.13] gh-146202: Create tmp_dir in regrtest worker (GH-146347)
#146350
[3.13] gh-145098: Use `macos-15-intel` instead of unstable `macos-26-intel` in `{jit,tail-call}.yml` (GH-148126)
#148136
[3.13] gh-125895: Fix static asset location for `sphinx-notfound-page` (GH-147984)
#148041
[3.13] gh-148157: Check for `_PyPegen_add_type_comment_to_arg` fail in `_PyPegen_name_default_pair` (GH-148158)
#148163
[3.13] gh-143636: fix a crash when calling ``__replace__`` on invalid `SimpleNamespace` instances (GH-143655)
#145940

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Top Contributors in v3.13.13

miss-islington
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