CVE-2026-55999CWE-122

xorg-server / xwayland glamor font atlas Heap Buffer Overflow

High · published July 8, 2026

CVSS v3.1
8.5
EPSS
0%
Percentile
25.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00333 · 25.3th percentile
Weakness
CWE-122 · Heap-based Buffer Overflow
Published
2026-07-08T08:07Z
EPSS history
Timeline
  • 08 JUL 08:07Z
    xorg-server / xwayland glamor font atlas Heap Buffer Overflow
    cvelistv5