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Title: gh-149816: Fix SNI callback callable race by kiri11 · Pull Request #150018 · python/cpython · GitHub

Open Graph Title: gh-149816: Fix SNI callback callable race by kiri11 · Pull Request #150018 · python/cpython

X Title: gh-149816: Fix SNI callback callable race by kiri11 · Pull Request #150018 · python/cpython

Description: The Python programming language. Contribute to python/cpython development by creating an account on GitHub.

Open Graph Description: Problem Fix a use-after-free race in the SSL SNI callback on free-threaded builds. When sni_callback is replaced or cleared on one thread while another thread is mid-handshake, the old callback obj...

X Description: Problem Fix a use-after-free race in the SSL SNI callback on free-threaded builds. When sni_callback is replaced or cleared on one thread while another thread is mid-handshake, the old callback obj...

Opengraph URL: https://github.com/python/cpython/pull/150018

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May 19, 2026https://github.com/python/cpython/pull/150018#issuecomment-4490883361
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May 19, 2026https://github.com/python/cpython/pull/150018#event-25721558019
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: Fix SNI callback callable race (https://github.com/python/cpython/commit/2744371e4f2a208ad4a99fe12c405157a199afe3
GH-150018https://github.com/python/cpython/pull/150018
) (https://github.com/python/cpython/commit/2744371e4f2a208ad4a99fe12c405157a199afe3
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)https://github.com/python/cpython/commit/2744371e4f2a208ad4a99fe12c405157a199afe3
2744371https://github.com/python/cpython/commit/2744371e4f2a208ad4a99fe12c405157a199afe3
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https://github.com/colesbury
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May 21, 2026 https://github.com/python/cpython/pull/150018#ref-issue-4495402705
Data race in test_ssl.test_sni_callback_race #150191 https://github.com/python/cpython/issues/150191
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Jun 8, 2026 https://github.com/python/cpython/pull/150018#ref-commit-9997975
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[3.15]https://github.com/python/cpython/commit/99979753b38f64a6cdbe37990eaaeb2af440e140
gh-149816https://github.com/python/cpython/issues/149816
: Fix SNI callback callable race (https://github.com/python/cpython/commit/99979753b38f64a6cdbe37990eaaeb2af440e140
GH-150018https://github.com/python/cpython/pull/150018
) (https://github.com/python/cpython/commit/99979753b38f64a6cdbe37990eaaeb2af440e140
GH-150099https://github.com/python/cpython/pull/150099
)https://github.com/python/cpython/commit/99979753b38f64a6cdbe37990eaaeb2af440e140
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Jul 10, 2026https://github.com/python/cpython/pull/150018#issuecomment-4933505766
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