Security advisory: CVE-2026-105923 - Null-pointer dereference in QTriangulator reachable through VectorImage

A denial-of-service vulnerability in the Qt Framework VectorImage QML type of the Qt Quick Vector Image module has been discovered and has been assigned the CVE id CVE-2026-105923.

Affected versions: from Qt 6.8.0 to Qt 6.8.8, from Qt 6.9.0 to Qt 6.11.2

Impact: Processing specially crafted SVG content with the VectorImage QML type can cause the application to crash, resulting in loss of availability.

CVSS 4.0 Score: 4.0 / MEDIUM

Vector String: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/AU:N/R:U/RE:L/U:Green

Mitigation: Do not load untrusted SVG files with the VectorImage QML type.

Solution: Apply the following patch or update to Qt 6.8.9, Qt 6.11.3 or Qt 6.12.0 or later.

Patches:
dev: https://codereview.qt-project.org/c/qt%2Fqtbase/+/762279

Qt 6.11: https://codereview.qt-project.org/c/qt%2Fqtbase/+/763446 or https://download.qt.io/official_releases/qt/6.11/CVE-2026-105923-qtbase-6.11-0001.diff

Qt 6.8: https://codereview.qt-project.org/c/qt%2Ftqtc-qtbase/+/763490 or https://download.qt.io/archive/qt/6.8/CVE-2026-105923-qtbase-6.8-0001.diff