CVE-2025-26596
7.8
HIGH
CVSS 3.1
EPSS 0.03%
Description
A heap overflow flaw was found in X.Org and Xwayland. The computation of the length in XkbSizeKeySyms() differs from what is written in XkbWriteKeySyms(), which may lead to a heap-based buffer overflow.
How to fix CVE-2025-26596
To remediate CVE-2025-26596, upgrade the affected package to a fixed version below.
- Debian/xorg-server—upgrade to 2:1.20.11-1+deb11u15 or later
- Debian/xwayland—no fix listed
Is CVE-2025-26596 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 2:1.20.11-1+deb11u15
- from 0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |