CVE-2026-8168

Denial-of-service vulnerability in the SVG parser and renderer impacts Qt

State: Published
Severity: 7.1 High
Published: Oct 19, 2026
Updated: Oct 19, 2026
Reserved: May 8, 2026

Description

Uncontrolled recursion in the SVG parser and renderer of the Qt SVG module (QtSvg) in Qt Group Qt allows attackers to cause a denial of service (application crash via stack exhaustion) via a crafted SVG file with deeply nested elements.

Scores

CVSS	Score	Vector	Source
4.0	7.1 High	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	Qt

Weaknesses

CWE-674 Uncontrolled Recursion

Affected Products

Product	Versions
qtqt	4.1.0 to before 6.8.9Affected 6.9.0 to before 6.11.2Affected before 4.1.0Unknown

References

Propagate QSvgExtraStates variables to pattern and mask elementsvendor-advisory
Fix rendering causing stack overflowpatch
Fix resolving paint servers going through stack overflowpatch
Fix stack overflow caused by recursive calls of destructorspatch
Add a test for deeply nested SVG filespatch
Add baseline test for deeply nested elementspatch
Speed up QSvgStructureNode::releaseDescendants()patch
Fix stack overflow in detectCyclespatch
Use bottom tested loop in detectCycles()patch
Apply and revert styles iterativelypatch
Propagate QSvgExtraStates variables to pattern and mask elementspatch

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