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… cleared (pythonGH-161061) Expat calls the default handler once per 1024-byte piece of a token that needs encoding conversion. Install a no-op instead of NULL when the handler is cleared after an error or unset from within a callback, as is already done for the character data handler. ANT-2026-0SJB3WWC (cherry picked from commit 0fbe3bb)
This was referenced Nov 12, 2026
gpshead
marked this pull request as ready for review
November 12, 2026 02:32
gpshead
enabled auto-merge (squash)
November 12, 2026 02:37
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Expat calls the default handler once per 1024-byte piece of a token that
needs encoding conversion. Install a no-op instead of NULL when the
handler is cleared after an error or unset from within a callback, as is
already done for the character data handler.
ANT-2026-0SJB3WWC
(cherry picked from commit 0fbe3bb)
Manual backport notes
Cherry-picked from the 3.15 backport (GH-161842) rather than from
main; miss-islington's automatic 3.14 backport failed on conflicts. Both conflicts were inModules/pyexpat.c:RC_HANDLERmacro: 3.15 callsinvalid_expat_handler_rv()afterPy_DECREF(rv), a helper that does not exist on 3.14. Only the fix itself was kept (self->in_callback = 0moved to after thePy_DECREF(rv)); the helper was not brought over.xmlparse_handler_setter: the context line on 3.14 lacked the(xmlhandler)cast.xml.parsers.expatcrashes whenDefaultHandlerraises on a long non-UTF-8 token #161060