High [CVE-2026-11573] Denial of Service via uncontrolled recursion in XML serialization
This high-severity Red Hat Linux advisory covers CVE-2026-11573 affecting Red Hat Enterprise Linux 10, Red Hat package: qt6-qtbase.
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Summary
A flaw was found in qtbase. Uncontrolled recursion in Qt's QDomDocument serialization (QtXml) allows a remote attacker to provide deeply nested untrusted XML, leading to stack exhaustion.
This can cause the application to crash, resulting in a Denial of Service (DoS). Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-776. Affected Red Hat products: Red Hat Enterprise Linux 10.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: qt6-qtbase.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation checklist
- To mitigate this issue, applications that use Qt's QDomDocument for XML serialization should avoid processing untrusted XML input. If processing untrusted XML is unavoidable, implement robust input validation and sanitization to prevent deeply nested structures before passing the data to the QtXml component. This requires application-level changes or careful operational procedures to ensure only trusted XML is processed.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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