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Title: Upgrade bundled Expat to 2.8.1 (e.g. for the fix to CVE-2026-45186) · Issue #149698 · python/cpython · GitHub

Open Graph Title: Upgrade bundled Expat to 2.8.1 (e.g. for the fix to CVE-2026-45186) · Issue #149698 · python/cpython

X Title: Upgrade bundled Expat to 2.8.1 (e.g. for the fix to CVE-2026-45186) · Issue #149698 · python/cpython

Description: Please see blog post https://blog.hartwork.org/posts/expat-2-8-1-released/ for an overview and the change log at https://github.com/libexpat/libexpat/blob/R_2_8_1/expat/Changes for details. Affects all alive branches of Python. Thank you...

Open Graph Description: Please see blog post https://blog.hartwork.org/posts/expat-2-8-1-released/ for an overview and the change log at https://github.com/libexpat/libexpat/blob/R_2_8_1/expat/Changes for details. Affects...

X Description: Please see blog post https://blog.hartwork.org/posts/expat-2-8-1-released/ for an overview and the change log at https://github.com/libexpat/libexpat/blob/R_2_8_1/expat/Changes for details. Affects...

Opengraph URL: https://github.com/python/cpython/issues/149698

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Upgrade bundled Expat to 2.8.1 (e.g. for the fix to CVE-2026-45186)https://github.com/python/cpython/issues/149698#top
https://github.com/StanFromIreland
3.10only security fixeshttps://github.com/python/cpython/issues?q=state%3Aopen%20label%3A%223.10%22
3.11only security fixeshttps://github.com/python/cpython/issues?q=state%3Aopen%20label%3A%223.11%22
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type-securityA security issuehttps://github.com/python/cpython/issues?q=state%3Aopen%20label%3A%22type-security%22
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on May 11, 2026https://github.com/python/cpython/issues/149698#issue-4423908896
https://blog.hartwork.org/posts/expat-2-8-1-released/https://blog.hartwork.org/posts/expat-2-8-1-released/
https://github.com/libexpat/libexpat/blob/R_2_8_1/expat/Changeshttps://github.com/libexpat/libexpat/blob/R_2_8_1/expat/Changes
#149017https://github.com/python/cpython/issues/149017
@StanFromIrelandhttps://github.com/StanFromIreland
CVE-2026-45186https://github.com/advisories/GHSA-r396-2q2c-pjhr
gh-149698: Update bundled expat to 2.8.1 #149699https://github.com/python/cpython/pull/149699
[3.15] gh-149698: Update bundled expat to 2.8.1 (GH-149699) #149812https://github.com/python/cpython/pull/149812
[3.14] gh-149698: Update bundled expat to 2.8.1 (GH-149699) #149813https://github.com/python/cpython/pull/149813
[3.13] gh-149698: Update bundled expat to 2.8.1 (GH-149699) #149827https://github.com/python/cpython/pull/149827
[3.12] gh-149698: Update bundled expat to 2.8.1 (GH-149699) #150020https://github.com/python/cpython/pull/150020
StanFromIrelandhttps://github.com/StanFromIreland
3.10only security fixeshttps://github.com/python/cpython/issues?q=state%3Aopen%20label%3A%223.10%22
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