ByteOS Network

NVD Vulnerability Details :

CVE-2026-55999

Analyzed

Source-meissner@suse.de

Published At-08 Jul, 2026 | 09:16

Updated At-09 Jul, 2026 | 19:49

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.

Date Added	Due Date	Vulnerability Name	Required Action
	N/A

Metrics

Type	Version	Base score	Base severity	Vector
Secondary	3.1	8.5	HIGH	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Primary	3.1	7.8	HIGH	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
			N/A

Type: Secondary

Version: 3.1

Base score: 8.5

Base severity: HIGH

Vector:

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Type: Primary

Version: 3.1

Base score: 7.8

Base severity: HIGH

Vector:

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Type: N/A

Version:

Base score:

Base severity: N/A

Vector:

CPE Matches

X.Org Foundation

>>x_server>>Versions before 21.2.24(exclusive)

cpe:2.3:a:x.org:x_server:*:*:*:*:*:*:*:*

X.Org Foundation

>>xwayland>>Versions before 24.1.13(exclusive)

cpe:2.3:a:x.org:xwayland:*:*:*:*:*:*:*:*

Weaknesses

CWE ID	Type	Source
CWE-122	Secondary	meissner@suse.de

CWE ID: CWE-122

Type: Secondary

Source: meissner@suse.de

References

Hyperlink	Source	Resource
https://gitlab.freedesktop.org/xorg/xserver/-/commit/fbf7bac22e2c6bd627fb042742a23318263edae1	meissner@suse.de	Patch
https://www.openwall.com/lists/oss-security/2026/07/08/2	meissner@suse.de	Mailing List Patch Third Party Advisory

Hyperlink: https://gitlab.freedesktop.org/xorg/xserver/-/commit/fbf7bac22e2c6bd627fb042742a23318263edae1

Source: meissner@suse.de

Resource:

Patch

Hyperlink: https://www.openwall.com/lists/oss-security/2026/07/08/2

Source: meissner@suse.de

Resource:

Mailing List

Patch

Third Party Advisory

CISA Catalog

Metrics

CPE Matches

Weaknesses

Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References

Change History