Vulnerability in qt

[ Description ]Official description

Authentication bypass vulnerability in the password authentication mechanism of the Qt VNC Server module. An attacker using a specially modified VNC client that violates the RFB protocol can bypass Qt VNC Server's password authentication and gain unauthorized remote access to the shared application, compromising the confidentiality and integrity of the session.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund24 Sep 2026WID-SEC-2026-3586

  QT: Vulnerability allows bypassing security measures Translated from German

  CVE-2026-79680

[ References ]References

• codereview.qt-project.org/c/qt/tqtc-qtvncserver/+/759160
• wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products