Description
An issue was discovered in Qt before 5.15.16, 6.x before 6.2.10, and 6.3.x through 6.5.x before 6.5.3 on Windows. When using the GDI font engine, if a corrupted font is loaded via QFontDatabase::addApplicationFont{FromData], then it can cause the application to crash because of missing length checks.
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.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | qt6-base +2 | No fix yet | — |
| Ubuntu 26.04 LTS | qtbase-opensource-src +1 | No fix yet | — |
| Ubuntu 25.10 | qt6-base +2 | No fix yet | — |
| Ubuntu 24.04 LTS | qt6-base +2 | No fix yet | — |
| Ubuntu 22.04 LTS | qt6-base +2 | No fix yet | — |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | qtbase-opensource-src-gles | No fix yet | — |
| Ubuntu 18.04 LTS | qt4-x11 | No fix yet | — |
| Ubuntu 16.04 LTS | qt4-x11 +1 | No fix yet | — |
| Ubuntu 14.04 LTS | qt4-x11 | No fix yet | — |
| Ubuntu Pro 24.04 LTS | qtbase-opensource-src | No fix yet | — |
| Ubuntu Pro 22.04 LTS | qtbase-opensource-src | No fix yet | — |
| Ubuntu Pro 20.04 LTS | qtbase-opensource-src | No fix yet | — |
| Ubuntu Pro 18.04 LTS | qtbase-opensource-src | No fix yet | — |
| Ubuntu Pro 16.04 LTS | qtbase-opensource-src | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | libqt5-qtbase | 5.15.11+kde134-1.1 | openSUSE-SU-2024:13308-1 |
Advisories 2
- openSUSE-SU-2024:13308-1 libQt5Bootstrap-devel-static-32bit-5.15.11+kde134-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2023-2373 QT: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Sep 17, 2023