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Upgrade bundled Expat to 2.9.0 (e.g. for fixes to two vulnerabilities) #158876

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Upgrade bundled Expat to 2.9.0 (e.g. for fixes to two vulnerabilities)#158876
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StanFromIreland
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3.11only security fixes3.12only security fixes3.13only security fixes3.14bugs and security fixes3.15pre-release feature fixes, bugs and security fixes3.16new features, bugs and security fixesextension-modulesC modules in the Modules dirtopic-XMLtype-securityA security issue

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@hartwork
hartwork
opened on Oct 5, 2026

Please see blog post https://blog.hartwork.org/posts/expat-2-9-0-released/ for an overview and the change log at https://github.com/libexpat/libexpat/blob/R_2_9_0/expat/Changes for details. Affects all alive branches of Python. Thank you!

Related: #157953 (predecessor for Expat 2.8.5)

CC @StanFromIreland

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3.11only security fixes3.12only security fixes3.13only security fixes3.14bugs and security fixes3.15pre-release feature fixes, bugs and security fixes3.16new features, bugs and security fixesextension-modulesC modules in the Modules dirtopic-XMLtype-securityA security issue

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