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Cpython v3.15.0a5

Cpython: v3.15.0a5 Release

Release date:
January 14, 2026
Previous version:
v3.15.0a4 (released January 13, 2026)
Magnitude:
6,488 Diff Delta
Contributors:
34 total committers
Data confidence:
Commits:
70 impacting commits

126 Features Released with v3.15.0a5

gh-138122: Convert GIL/GC/exception stats from tiles to progress bars
#143177
gh-143040: Exit taychon live mode gracefully and display profiled script errors
#143101
gh-142830: prevent some crashes when mutating `sqlite3` callbacks
#143245
gh-143309: fix UAF in `os.execve` when the environment is concurrently mutated
#143314
gh-143200: fix UAFs in `Element.__{set,get}item__` when the element is concurrently mutated
#143226
gh-143310: fix crash in Tcl object conversion with concurrent mutations
#143321
JIT: don't leak shim memory when shutting down the interpreter
#142984
gh-140025: Fix `queue.SimpleQueue.__sizeof__()`
#143137
gh-143377: fix crashes in `_interpreters.capture_exception`
#143418
gh-142939: difflib.get_close_matches performance
#142940
gh-141671: PyMODINIT_FUNC: apply `__declspec(dllexport)` on Windows
#141672
JIT: Move executor to a register
#143072
gh-140648: Make asyncio REPL respect the `-I` flag (isolated mode)
#143045
gh-143189: fix insertdict() for non-Unicode key
#143285
gh-143195: fix UAF in `{bytearray,memoryview}.hex(sep)` via re-entrant `sep.__len__`
#143209
gh-142557: fix UAF in `bytearray.__mod__` when object is mutated while formatting `%`-style arguments
#143213
gh-142664: fix UAF in `memoryview.__hash__` via re-entrant data's `__hash__`
#143217
gh-142927: Auto-open HTML output in browser after generation
#143178
Add Emscripten test skips for recently added tests.
#143551
Bump GitHub Actions
#143757
gh-132108: Add Buffer Protocol support to int.from_bytes to improve performance
#132109
Remove outdated comment.
#143669
gh-140806: add docs for `enum.bin` function
#140807
gh-143331: Schedule to remove format "N" for Decimal
#143372
gh-143309: fix `test_execve_env_concurrent_mutation_with_fspath_posix` buildbot failure
#143415
gh-141536: Fix a crash when running test_capi *after* test_code in the same process
#141537
Correctly fold unknown-8bit originating from encoded words.
#142517
gh-143517: Fix an edge case in rewriting stringified starred annotations
#143518
gh-143460: Correct unlimited stack size skip for Emscripten
#143765
gh-142664: fix `PyObject_Hash` invokation post GH-143217
#143223

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Top Contributors in v3.15.0a5

chris-eibl
Zheaoli
picnixz
ivonastojanovic
mgmacias95
caje731
diegorusso
johnslavik
Aniketsy
dg-pb

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