Qt up to 6.8.7/6.11.0 SVG Image type confusion

Summaryinfo

A vulnerability, which was classified as problematic, was found in Qt up to 6.8.7/6.11.0. This issue affects some unknown processing of the component SVG Image Handler. Executing a manipulation can lead to type confusion. This vulnerability is tracked as CVE-2026-6210. The attack can be launched remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in Qt up to 6.8.7/6.11.0 and classified as problematic. This vulnerability affects some unknown functionality of the component SVG Image Handler. The manipulation with an unknown input leads to a type confusion vulnerability. The CWE definition for the vulnerability is CWE-843. The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type. As an impact it is known to affect availability. CVE summarizes:

A type confusion vulnerability in Qt SVG allows an attacker to cause an application crash via a crafted SVG image. When processing SVG marker references, the renderer retrieves a node by its id attribute and casts it to QSvgMarker* without verifying the node type. A non-marker element (such as a <line> element) that references itself as a marker triggers an out-of-bounds heap read due to the object size difference between QSvgLine and QSvgMarker, followed by an endless recursion that bypasses the marker recursion guard through incorrect virtual dispatch. The result is an application crash (denial of service). This issue affects Qt SVG:  from 6.7.0 before 6.8.8, from 6.9.0 before 6.11.1.

The advisory is shared for download at codereview.qt-project.org. This vulnerability was named CVE-2026-6210 since 04/13/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available.

Upgrading to version 6.8.8 or 6.11.1 eliminates this vulnerability.

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Productinfo

Name

• Qt

Version

• 6.0
• 6.1
• 6.2
• 6.3
• 6.4
• 6.5
• 6.6
• 6.7
• 6.8
• 6.8.0
• 6.8.1
• 6.8.2
• 6.8.3
• 6.8.4
• 6.8.5
• 6.8.6
• 6.8.7
• 6.9
• 6.10
• 6.11.0

License

• open-source

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CPE 2.2info

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