CVE-2026-34002

Medium

Description

A flaw was found in the X.Org X server. This vulnerability, an out-of-bounds read, affects the XKB (X Keyboard Extension) modifier map handling. An attacker with access to the X11 server can exploit this by sending a malformed request, which causes the server to read beyond its intended memory boundaries. This can lead to the exposure of sensitive information or cause the server to crash, resulting in a denial of service.

SeverityMedium

CVSS6.1

Exploit probability—

Product

X.org X Server

PublishedMay 5, 2026

First seenMay 5, 2026

Weakness typeCWE-805CWE-805

How to fix

Vendor advisories

Affected products

Product	Affected versions	Fixed in
x.org x_server	No range specified	—
redhat enterprise_linux	6.0, 7.0, 8.0, 9.0, 10.0	—

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