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[security] Please upgrade bundled Expat to 2.8.0 (e.g. for the fix to CVE-2026-41080) #149017

@hartwork

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@hartwork

Please see blog post https://blog.hartwork.org/posts/expat-2-8-0-released/ for an overview and the change log at https://github.com/libexpat/libexpat/blob/R_2_8_0/expat/Changes for details. Affects all alive branches of Python. Thank you!

Related: #146083 (predecessor for Expat 2.7.5)

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3.10only security fixes3.11only security fixes3.12only security fixes3.13bugs and security fixes3.14bugs and security fixes3.15new features, bugs and security fixesextension-modulesC modules in the Modules dirtopic-XMLtype-securityA security issue

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