A flaw was found in libxml2. A local user or an attacker providing a specially crafted XML catalog can trigger a NULL pointer dereference during XML catalog parsing. This occurs when a `nextCatalog` element lacks its mandatory `catalog` attribute, leading to the application crashing and causing a Denial of Service (DoS).
https://gitlab.gnome.org/GNOME/libxml2/-/merge_requests/442
https://gitlab.gnome.org/GNOME/libxml2/-/commit/c6324894