Packages
- libvncserver - vnc server library
Details
It was discovered that LibVNCServer had a memory leak in the client cleanup
function. An attacker could possibly use this issue to cause LibVNCServer
to consume memory, leading to a denial of service. This issue only affected
Ubuntu 22.04 LTS. (CVE-2020-29260)
It was discovered that LibVNCServer did not properly validate bounds when
handling UltraZip encoding subrectangles. A remote attacker could possibly
use this issue to obtain sensitive information or cause a denial of
service. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and
Ubuntu 25.04. (CVE-2026-32853)
It was discovered that LibVNCServer did not properly validate return values
in the HTTP proxy handlers. A remote attacker could possibly use this issue
to cause LibVNCServer to crash, resulting in a denial of service. This
issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS,...
It was discovered that LibVNCServer had a memory leak in the client cleanup
function. An attacker could possibly use this issue to cause LibVNCServer
to consume memory, leading to a denial of service. This issue only affected
Ubuntu 22.04 LTS. (CVE-2020-29260)
It was discovered that LibVNCServer did not properly validate bounds when
handling UltraZip encoding subrectangles. A remote attacker could possibly
use this issue to obtain sensitive information or cause a denial of
service. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and
Ubuntu 25.04. (CVE-2026-32853)
It was discovered that LibVNCServer did not properly validate return values
in the HTTP proxy handlers. A remote attacker could possibly use this issue
to cause LibVNCServer to crash, resulting in a denial of service. This
issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 25.04.
(CVE-2026-32854)
It was discovered that LibVNCServer did not properly handle Tight encoding
gradient filter rectangles. A remote attacker could use this issue to cause
LibVNCServer to crash, resulting in a denial of service, or possibly
execute arbitrary code. (CVE-2026-44988)
Update instructions
In general, a standard system update will 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 | ||
|---|---|---|---|
| 26.04 LTS resolute | libvncclient1 – 0.9.15+dfsg-3ubuntu0.1 | ||
| libvncserver1 – 0.9.15+dfsg-3ubuntu0.1 | |||
| 25.10 questing | libvncclient1 – 0.9.15+dfsg-1ubuntu0.1 | ||
| libvncserver1 – 0.9.15+dfsg-1ubuntu0.1 | |||
| 24.04 LTS noble | libvncclient1 – 0.9.14+dfsg-1ubuntu0.1 | ||
| libvncserver1 – 0.9.14+dfsg-1ubuntu0.1 | |||
| 22.04 LTS jammy | libvncclient1 – 0.9.13+dfsg-3ubuntu0.1 | ||
| libvncserver1 – 0.9.13+dfsg-3ubuntu0.1 | |||
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