CVE-2026-50262

Medium

Description

An out-of-bounds read flaw was found in the X.Org X server and Xwayland in __glXDisp_ChangeDrawableAttributes(). A wrong size validation check can read a client-controlled number of bytes, exceeding the request buffer, leading to information disclosure. A write path also exists but requires byte-swapped clients which is disabled by default.

SeverityMedium

CVSS5.5

Exploit probability—

Product

X.org Xwayland

PublishedJun 5, 2026

First seenJun 5, 2026

Weakness typeCWE-125Out-of-bounds read

How to fix

Update

x.org xwayland24.1.12 or later
x.org x_server21.1.23 or later

Patches

gitlab.freedesktop.org/xorg/xserver/-/commit/6d459e4daf715bea8abdafa8fb130be2f8a1d145

Vendor advisories

Affected products

Product	Affected versions	Fixed in
x.org xwayland	v < 24.1.12	24.1.12
x.org x_server	v < 21.1.23	21.1.23
redhat enterprise_linux	7.0, 8.0, 9.0, 10.0	—

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