USN-9089-1: x11vnc vulnerability
Publication date
12 November 2026
Overview
x11vnc could be made to expose sensitive information to local users.
Releases
Packages
- x11vnc - VNC server to allow remote access to an existing X session
Details
It was discovered that x11vnc created shared memory segments with insecure
permissions. A local attacker could possibly use this issue to obtain
sensitive information or modify screen contents.
It was discovered that x11vnc created shared memory segments with insecure
permissions. A local attacker could possibly use this issue to obtain
sensitive information or modify screen contents.
Update instructions
After a standard system update you need to restart x11vnc to make all the necessary changes.
Learn more about how to get the fixes.The problem can be corrected by updating your system to the following package versions:
| Ubuntu Release | Package Version | ||
|---|---|---|---|
| 20.04 LTS focal | x11vnc – 0.9.16-3ubuntu0.1~esm2 | ||
Reduce your security exposure
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