CVE-2026-6210 Details
Description
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.
A type confusion vulnerability has been identified in Qt SVG versions 6.7.0 prior to 6.8.8 and 6.9.0 prior to 6.11.1. This vulnerability allows an attacker to cause an application crash by exploiting how SVG marker references are processed. The renderer retrieves nodes by their id attribute and incorrectly casts them to QSvgMarker pointers without verifying the node type. When a non-marker element, such as a line, references itself as a marker, it triggers an out-of-bounds heap read due to the size difference between QSvgLine and QSvgMarker. This is followed by an endless recursion that bypasses the marker recursion guard, leading to a denial-of-service condition by crashing the application.
Users can upgrade to Qt SVG versions 6.11.1 or higher, or versions 6.8.8 and 6.11.1, to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No CVSS 3.x data is available for this CVE.
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed May 6, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://codereview.qt-project.org/c/qt/qtsvg/+/724887 | TQtC | |
| https://issues.oss-fuzz.com/issues/496327371 | TQtC |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-122 | Heap-based Buffer Overflow | TQtC |
| CWE-843 | Access of Resource Using Incompatible Type ('Type Confusion') | TQtC |
Affected Products
No affected product data is available for this CVE.
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 29, 2026 | CVE Modified | TQtC |
| Jun 17, 2026 | CVE Modified | TQtC |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 6, 2026 | New CVE Received | TQtC |