Hi, some words also from me: There is no deleting of functions in expat version from 2.6.4 to 2.8.3 Backwards compatibility should be intact. There is a deprecation of one of hash function XML_SetHashSalt but it is still possible to be used The biggest change that could potentially break some unsafe code is the fix for CVE-2026-50219 it makes parser rejecting free/reset/re-entry when it is already in used, so it is defending against possible memory corruption. As it is a fix for security vulnerability I think we can take that risk.
I have also tested it using ptest from packages that use expat it in runtime like python-xml or libxml-parser-perl and all tests passed. Best regards, Jakub Szczudlo
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