CVE-2026-56002 - Vulnerability Details - OpenCVE

A heap bufferflow in pcfReadFont() due to missing glyph bounds checking in libXfont2 before 2.0.8 allows attackers authenticated as X client to execute code within the X server.

No CVSS v4.0

Attack Vector Network

Attack Complexity High

Privileges Required Low

Scope Changed

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00529.

Exploitation none

Automatable no

Technical Impact total

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

X.Org

libXfont2

unaffected

Version	Status	Constraints
`0`	affected	< 2.0.8

No data.

No data.

No data.

Project Subscriptions

Vendors	Products
X.org Subscribe	Libxfont2 Subscribe

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References

Link	Providers
https://gitlab.freedesktop.org/xorg/lib/libxfont/-/commit/b4389e0b1d84a690b819bb27b1439968811a3674
https://www.openwall.com/lists/oss-security/2026/07/08/1

History

Wed, 08 Jul 2026 12:30:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Wed, 08 Jul 2026 10:00:00 +0000

Type	Values Removed	Values Added
Description		A heap bufferflow in pcfReadFont() due to missing glyph bounds checking in libXfont2 before 2.0.8 allows attackers authenticated as X client to execute code within the X server.
Title		libXfont2 PCF Font Parsing Heap Buffer Overflow
First Time appeared		X.org X.org libxfont2
Weaknesses		CWE-122
CPEs		cpe:2.3:a:x.org:libxfont2::::::::
Vendors & Products		X.org X.org libxfont2
References		https://gitlab.freedesktop.org/xorg/lib/libxfont/-/commit/b4389e0b1d84a690b819bb27b1439968811a3674 https://www.openwall.com/lists/oss-security/2026/07/08/1
Metrics		cvssV3_1 `{'score': 8.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H'}`

Projects

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MITRE

Status: PUBLISHED

Assigner: suse

Published: 2026-07-08T09:12:51.480Z

Updated: 2026-07-08T12:07:36.415Z

Reserved: 2026-06-18T09:26:55.988Z

Link: CVE-2026-56002

Vulnrichment

Updated: 2026-07-08T12:07:30.351Z

NVD

No data.

Redhat

No data.

OpenCVE Enrichment

No data.

Weaknesses

CWE-122

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