Description
Resource exhaustion vulnerability in the Qt Framework QWebSocket and QWebSocketServer classes of the Qt WebSockets module
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Qt | Qt Framework | 6.9.0 ≤6.12.0 | — |
| Qt | Qt Framework | 5.15.0 ≤6.8.9 | — |
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 24.04 LTS | qtstyleplugins-src | No fix yet | — |
| Ubuntu 22.04 LTS | qtstyleplugins-src | No fix yet | — |
| Ubuntu 20.04 LTS | qtstyleplugins-src | No fix yet | — |
| Ubuntu 18.04 LTS | qtstyleplugins-src | No fix yet | — |
| Ubuntu 16.04 LTS | qtstyleplugins-src | No fix yet | — |
Advisories 1
- WID-SEC-2026-4531 QT: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Nov 12, 2026