Uncontrolled recursion (CWE-674) in the QDomDocument/QDomNode serialization path of the Qt XML module (QtXml, qtbase). QDomElementPrivate::save() and QDomNodePrivate::save() recurse mutually, consuming one stack frame per level of element nesting with no depth limit, no configurable bound and no error return. A document with deeply nested elements parses successfully but exhausts the call stack and terminates the process when serialized. Reachable via QDomDocument::toByteArray() (Qt 4.0 and later), QDomDocument::toString(), QDomDocument::toCString(), QDomNode::save(), and operator<<(QTextStream&, const QDomNode&). Denial of service only — no code execution and no memory disclosure.

Uncontrolled recursion in Qt's QDomDocument serialization (QtXml) lets deeply nested untrusted XML crash the app via stack exhaustion (DoS only).

Affected: Ubuntu:Pro:16.04:LTS: qtbase-opensource-src, Ubuntu:Pro:18.04:LTS: qtbase-opensource-src, Ubuntu:Pro:20.04:LTS: qtbase-opensource-src, Ubuntu:22.04:LTS: qt6-base, Ubuntu:Pro:22.04:LTS: qtbase-opensource-src, Ubuntu:24.04:LTS: qt6-base, Ubuntu:Pro:24.04:LTS: qtbase-opensource-src, Ubuntu:26.04:LTS: qtbase-opensource-src

Uncontrolled recursion (CWE-674) in the QDomDocument/QDomNode serialization path of the Qt XML module (QtXml, qtbase). QDomElementPrivate::save() and QDomNodePrivate::save() recurse mutually, consuming one stack frame per level of element nesting with no depth limit, no configurable bound and no error return. A document with deeply nested elements parses successfully but exhausts the call stack and terminates the process when serialized. Reachable via QDomDocument::toByteArray() (Qt 4.0 and later), QDomDocument::toString(), QDomDocument::toCString(), QDomNode::save(), and operator<<(QTextStream&, const QDomNode&). Denial of service only — no code execution and no memory disclosure.

Ein entfernter, anonymer Angreifer kann eine Schwachstelle in QT ausnutzen, um einen Denial of Service Angriff durchzuführen.