In libxml2 before 2.15.4, xmlDictAddQString in dict.c has an integer overflow and resultant heap-based buffer overflow.Referenceshttps://github.com/GNOME/libxml2/compare/v2.15.3...v2.15.4https://github.com/GNOME/libxml2/commit/a4cba4b5b5a8c42e155ed42d2d2a44955465a2e4
