Buffer Access with Incorrect Length Value The advisory has been revoked - it doesn't affect any version of package xorg-x11-server-Xdmx (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-CENTOS6-XORGX11SERVERXDMX-17912639
- published9 Jul 2026
- disclosed8 Jul 2026
Introduced: 8 Jul 2026
CVE-2026-55999 (opens in a new tab)Amendment
The Centos security team deemed this advisory irrelevant for Centos:6.
NVD Description
Note: Versions mentioned in the description apply only to the upstream xorg-x11-server-Xdmx package and not the xorg-x11-server-Xdmx package as distributed by Centos.
Local attackers with a X connection able to provide PCX fonts to the X server xorg-server before 21.2.24 and xwayland before 24.1.13 could cause a heap buffer overflow via SetFont due to missing glyph boundary checks.