CVE-2026-56002

High

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.

SeverityHigh

CVSS8.5

Exploit probability—

ProductLibxfont

PublishedJul 8, 2026

First seenJul 8, 2026

Weakness typeCWE-122CWE-122

How to fix

Update

x libxfont2.0.8 or later

Patches

gitlab.freedesktop.org/xorg/lib/libxfont/-/commit/b4389e0b1d84a690b819bb27b1439968811a3674

Vendor advisories

openwall.com/lists/oss-security/2026/07/08/1

Affected products

Product	Affected versions	Fixed in
x libxfont	v < 2.0.8	2.0.8

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