Out-of-bounds Read in X.org X_server

CVE-2026-50262

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 informati…

Vulnerability class: Buffer Overflow

EPSS: 0.001 (3.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-50262?
CVE-2026-50262 is a medium-severity vulnerability in X.org X_server, classified under Out-of-bounds Read. CVSS score: 5.5/10. Published 2026-06-05.
How severe is CVE-2026-50262?
Medium severity. CVSS v3 base score is 5.5 out of 10.