========================================================================== Ubuntu Security Notice USN-8494-1 July 02, 2026
libvncserver vulnerability ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 26.04 LTS - Ubuntu 25.10 - Ubuntu 24.04 LTS - Ubuntu 22.04 LTS Summary: LibVNCServer could be made to crash or run programs if it received specially crafted network traffic. Software Description: - libvncserver: vnc server library Details: It was discovered that LibVNCServer incorrectly handled the Tight decoder in libvncclient. A remote attacker could use this issue to cause LibVNCServer to crash, resulting in a denial of service, or possibly execute arbitrary code. Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 26.04 LTS libvncclient1 0.9.15+dfsg-3ubuntu0.2 libvncserver1 0.9.15+dfsg-3ubuntu0.2 Ubuntu 25.10 libvncclient1 0.9.15+dfsg-1ubuntu0.2 libvncserver1 0.9.15+dfsg-1ubuntu0.2 Ubuntu 24.04 LTS libvncclient1 0.9.14+dfsg-1ubuntu0.2 libvncserver1 0.9.14+dfsg-1ubuntu0.2 Ubuntu 22.04 LTS libvncclient1 0.9.13+dfsg-3ubuntu0.2 libvncserver1 0.9.13+dfsg-3ubuntu0.2 In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-8494-1 CVE-2026-50538 Package Information: https://launchpad.net/ubuntu/+source/libvncserver/0.9.15+dfsg-3ubuntu0.2 https://launchpad.net/ubuntu/+source/libvncserver/0.9.15+dfsg-1ubuntu0.2 https://launchpad.net/ubuntu/+source/libvncserver/0.9.14+dfsg-1ubuntu0.2 https://launchpad.net/ubuntu/+source/libvncserver/0.9.13+dfsg-3ubuntu0.2
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