Unbounded destructor recursion in the QDomNode destructor of Qt XML has been discovered and has been assigned the CVE id CVE-2026-19248.
Affected versions: from Qt 2.2.0 to Qt 6.8.8, from Qt 6.9.0 to Qt 6.11.1
Impact: Applications that parse untrusted or externally-supplied XML using the QDom classes (e.g. QDomDocument) may crash due to a denial-of-service condition. This may potentially be triggered remotely if the XML originates from an untrusted network source.
CVSS 4.0 Score: 7.1 (High)
Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/AU:N/R:U/V:D/RE:L
Mitigation:
- Use QXmlStreamReader / QXmlStreamWriter instead of QDomDocument.
- Limit the depth of the XML being parsed through other means.
- Increase the stack size from the default.
- Build Qt in a mode that uses less stack per frame than the default compiler settings.
Solution: Update to Qt 6.8.9, Qt 6.11.2, or later. Users remaining on the now-closed Qt 6.10 branch should apply the Qt 6.10 patch.
