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CVE-2026-55999

nvd nist
Published: Jul 8, 2026Modified: Jul 9, 2026

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7.8
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploitability: 1.8 / Impact: 5.9
Source: NVD

Description

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.

Affected (2)

Products: X.org: X Server, Xwayland
X.org
2 products
X Server
Xwayland
Configuration A
2 vulnerable
Vulnerable SoftwareAffected Versions
X Server
Before 21.2.24
Xwayland
Before 24.1.13

Related CWEs

CWE-122
Heap-based Buffer Overflow
A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

References (2)

Source: meissner@suse.de
Patch
Source: meissner@suse.de
Mailing ListPatchThird Party Advisory

Timeline

No history available yet.