libxml2 before 2.12.10 and 2.13.x before 2.13.6 has a use-after-free in xmlSchemaIDCFillNodeTables and xmlSchemaBubbleIDCNodeTables in xmlschemas.c. To exploit this, a crafted XML document must be validated against an XML schema with certain identity constraints, or a crafted XML schema must be used.
https://security.netapp.com/advisory/ntap-20250328-0010/
https://lists.debian.org/debian-lts-announce/2025/02/msg00028.html
https://gitlab.gnome.org/GNOME/libxml2/-/issues/828
http://seclists.org/fulldisclosure/2025/Apr/9
http://seclists.org/fulldisclosure/2025/Apr/8
http://seclists.org/fulldisclosure/2025/Apr/5
http://seclists.org/fulldisclosure/2025/Apr/4
http://seclists.org/fulldisclosure/2025/Apr/13
http://seclists.org/fulldisclosure/2025/Apr/12