In libxml2 before 2.15.4, xmlSnprintfElements in valid.c has a strcat stack-based buffer overflow.Referenceshttps://github.com/GNOME/libxml2/compare/v2.15.3...v2.15.4https://github.com/GNOME/libxml2/commit/d1686f91dbda141a752200419d35639fd6b38340
