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Title: gh-143195: fix UAF in `{bytearray,memoryview}.hex(sep)` via re-entrant `sep.__len__` by picnixz · Pull Request #143209 · python/cpython · GitHub

Open Graph Title: gh-143195: fix UAF in `{bytearray,memoryview}.hex(sep)` via re-entrant `sep.__len__` by picnixz · Pull Request #143209 · python/cpython

X Title: gh-143195: fix UAF in `{bytearray,memoryview}.hex(sep)` via re-entrant `sep.__len__` by picnixz · Pull Request #143209 · python/cpython

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Open Graph Description: Issue: Use-after-free in _Py_strhex_impl via re-entrant sep.__len__ in bytearray.hex #143195

X Description: Issue: Use-after-free in _Py_strhex_impl via re-entrant sep.__len__ in bytearray.hex #143195

Opengraph URL: https://github.com/python/cpython/pull/143209

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GH-143209https://github.com/python/cpython/pull/143209
#143219https://github.com/python/cpython/pull/143219
gh-143195https://github.com/python/cpython/issues/143195
GH-143209https://github.com/python/cpython/pull/143209
9976c2bhttps://github.com/python/cpython/commit/9976c2b6349a079ae39931d960b8c147e21c6c3f
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Feb 15, 2026 https://github.com/python/cpython/pull/143209#ref-commit-483fde4
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pythongh-143195https://github.com/python/cpython/issues/143195
: fix UAF inhttps://github.com/thunder-coding/cpython/commit/483fde4b85abbc8c298e7f382630377103ba66e7
{bytearray,memoryview}.hex(sep)https://github.com/thunder-coding/cpython/commit/483fde4b85abbc8c298e7f382630377103ba66e7
via re-…https://github.com/thunder-coding/cpython/commit/483fde4b85abbc8c298e7f382630377103ba66e7
483fde4https://github.com/thunder-coding/cpython/commit/483fde4b85abbc8c298e7f382630377103ba66e7
python#143209https://github.com/python/cpython/pull/143209
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May 15, 2026 https://github.com/python/cpython/pull/143209#ref-pullrequest-4452501611
gh-149816: Fix race condition in memoryview with free-threading #149858 https://github.com/python/cpython/pull/149858
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