Description
An integer overflow vulnerability in the Qt XML parsing (Qt5Compat / QXmlSimpleReader) functionality of Qt.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| qt | qt | 6.0.0 – ≤ 6.8.9, 6.9.0 – ≤ 6.11.2, 6.12.0 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | qt6-5compat | No fix yet | — |
| Debian 13 | qt6-5compat | No fix yet | — |
| Debian 12 | qt6-5compat | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | qt6-5compat | No fix yet | — |
| Ubuntu 26.04 LTS | qt6-5compat | No fix yet | — |
| Ubuntu 24.04 LTS | qt6-5compat | No fix yet | — |
| Ubuntu 22.04 LTS | qt6-5compat | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | qt6-qt5compat | 6.12.0-2.1 | openSUSE-SU-2026:12442-1 |
Advisories 2
- openSUSE-SU-2026:12442-1 libQt6Core5Compat6-6.12.0-2.1 on GA media SUSE / openSUSE Security Updates · Nov 6, 2026
- WID-SEC-2026-4287 QT: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Nov 2, 2026
References
- https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-100140: vendor-advisory
- https://codereview.qt-project.org/c/qt/qt5compat/+/768900 patch
- https://codereview.qt-project.org/c/qt/qt5compat/+/764751 patch
- https://codereview.qt-project.org/c/qt/qt5compat/+/768901 patch
- https://codereview.qt-project.org/c/qt/qt5compat/+/768902 patch