CVE-2026-56003 | A heap buffer overflow due to missing size checking in the p… | CVSS 8.5 HIGH

Description

A heap buffer overflow due to missing size checking in the property buffer when parsing PCF files in libXfont2 ComputeScaledProperties() before libXfont2 before 2.0.8 could be used by attackers using authenticated X clients to execute code within the X server.

Metadata

CVE ID: CVE-2026-56003
State: PUBLISHED
Assigner: suse
Reserved: 2026-06-18 09:26 UTC
Published: 2026-07-08 09:25 UTC
Last updated: 2026-07-08 12:06 UTC
Primary CWE: CWE-122
CWE-122 Heap-based buffer overflow
Vendor / Product: X.Org / libXfont2
Sources: cve.org · NVD

Severity & Metrics

8.5 HIGH CVSS 3.1

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

SSVC — CISA Coordinator

Exploitation: none
Automatable: no
Tech. Impact: total

Affected products (1)

Vendor	Product	Platform	Versions
X.Org	libXfont2	—	0 < 2.0.8

Weakness (CWE)

CWE	Source	Description
CWE-122	cna	CWE-122 Heap-based buffer overflow

CVSS scores (1)

Score	Severity	Version	Source	Vector
8.5	HIGH	3.1	cna	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

References (2)