A flaw was identified in the RelaxNG parser of libxml2 related to how external schema inclusions are handled. The parser does not enforce a limit on inclusion depth when resolving nested <include> directives. Specially crafted or overly complex schemas can cause excessive recursion during parsing. This may lead to stack exhaustion and application crashes, creating a denial-of-service risk.
https://gitlab.gnome.org/GNOME/libxml2/-/issues/998
https://bugzilla.redhat.com/show_bug.cgi?id=2429933