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CVE-2026-6210

CVE-2026-6210 · Type confusion and heap-buffer-overflow in Qt SVG marker handling causing application crash

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 8.7 · High · EPSS 0.5% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • qt

    Versions
    • ≥ 6.7.0, < 6.8.8: Affected (python)
    • ≥ 6.9.0, < 6.11.1: Affected (python)

    Update to 6.11.1; Update to 6.8.8

  • qt6-svg Debian:12

    Versions
    • 6.10.2-1
    • 6.10.2-2
    • 6.10.2-3
    • 6.10.2-4
    • 6.10.2-5
    • 6.10.2-6
    • 6.10.2-7
    • 6.10.2-8
    • 6.10.2-9
    • 6.11.2-1
    • 6.11.2-2
    • 6.4.2-2
    • 6.4.2-3
    • 6.4.2-4
    • 6.6.0-1
    • 6.6.0-2
    • 6.6.1-1
    • 6.6.2-1
    • 6.6.2-2
    • 6.7.2-1
    • 6.7.2-2
    • 6.7.2-3
    • 6.7.2-4
    • 6.7.2-5
    • 6.7.2-6
    • 6.8.2-1
    • 6.8.2-2
    • 6.8.2-3
    • 6.9.1-1
    • 6.9.1-2
    • 6.9.2-1
    • 6.9.2-2
    • 6.9.2-3
    • 6.9.2-4
    • 6.9.2-5
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • qt6-svg Debian:13

    Versions
    • 6.10.2-1
    • 6.10.2-2
    • 6.10.2-3
    • 6.10.2-4
    • 6.10.2-5
    • 6.10.2-6
    • 6.10.2-7
    • 6.10.2-8
    • 6.10.2-9
    • 6.11.2-1
    • 6.11.2-2
    • 6.8.2-3
    • 6.9.1-1
    • 6.9.1-2
    • 6.9.2-1
    • 6.9.2-2
    • 6.9.2-3
    • 6.9.2-4
    • 6.9.2-5
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • qt6-svg Debian:14

    Versions
    • 6.10.2-1
    • 6.10.2-2
    • 6.10.2-3
    • 6.10.2-4
    • 6.10.2-5
    • 6.8.2-3
    • 6.9.1-1
    • 6.9.1-2
    • 6.9.2-1
    • 6.9.2-2
    • 6.9.2-3
    • 6.9.2-4
    • 6.9.2-5
    Affected ranges
    • ECOSYSTEM: < 6.10.2-6

    Update to 6.10.2-6

  • qtsvg-opensource-src Debian:12

    Versions
    • 5.15.10-1
    • 5.15.10-2
    • 5.15.12-1
    • 5.15.13-1
    • 5.15.13-2
    • 5.15.15-1
    • 5.15.15-2
    • 5.15.17-1
    • 5.15.17-2
    • 5.15.17-3
    • 5.15.18-1
    • 5.15.19-1
    • 5.15.19-2
    • 5.15.8-3
    • 5.15.9-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • qtsvg-opensource-src Debian:13

    Versions
    • 5.15.15-2
    • 5.15.17-1
    • 5.15.17-2
    • 5.15.17-3
    • 5.15.18-1
    • 5.15.19-1
    • 5.15.19-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • qtsvg-opensource-src Debian:14

    Versions
    • 5.15.15-2
    • 5.15.17-1
    • 5.15.17-2
    • 5.15.17-3
    • 5.15.18-1
    • 5.15.19-1
    • 5.15.19-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • qt6-svg Ubuntu:22.04:LTS

    Versions
    • 6.2.2-2ubuntu1
    • 6.2.4-1ubuntu1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • qt6-svg Ubuntu:24.04:LTS

    Versions
    • 6.4.2-4ubuntu1
    • 6.4.2-4ubuntu2
    • 6.4.2-4ubuntu3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • qt6-svg Ubuntu:25.10

    Versions
    • 6.8.3-0ubuntu1
    • 6.9.2-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • qt6-svg Ubuntu:26.10

    Versions
    • 6.10.2-2
    • 6.10.2-8ubuntu1
    • 6.10.2-9
    • 6.11.2-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • qt6-svg Ubuntu:26.04:LTS

    Versions
    • 6.9.2-1
    • 6.9.2-4
    • 6.9.2-5
    • 6.10.2-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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