A high-severity denial of service vulnerability exists in the Qt XML module (QtXml, qtbase) affecting versions prior to 6.5.2-16.oe2403sp1. The flaw is due to uncontrolled recursion in the QDomDocument/QDomNode serialization path, where deeply nested XML elements cause stack exhaustion and process termination. This issue affects functions such as QDomDocument::toByteArray(), toString(), toCString(), QDomNode::save(), and the QTextStream operator for QDomNode. No code execution or memory disclosure is possible. A fix is available in version 6.5.2-16.oe2403sp1.