Vulnerability Report

CVE-2026-50263

Title: X.Org X Server & Xwayland Use-After-Free

Memory Corruption

Proof Of Concept

No public PoC currently indexed for CVE-2026-50263.

CWE Category CWE-416

Published Date Jun 05, 2026

Modified Date Jul 27, 2026

Exploit Status Not Found

Score 5.5 CVSS v3.1

Exploit Probability (EPSS)

0.14%

Vulnerability Summary

CVE-2026-50263: A use-after-free flaw was found in the X.Org X server and Xwayland in CreateSaverWindow(). A client can trigger a use-after-free read after changing window attributes and forcing the screen saver, leading to information disclosure.

Impacted Vendors

x.org 2

Reference Links

https://access.redhat.com/security/cve/CVE-2026-50263 https://bugzilla.redhat.com/show_bug.cgi?id=2485388 https://gitlab.freedesktop.org/xorg/xserver/-/commit/ecc634f1b2f7aa473d3a267eada98c4918bf9e05 https://lists.x.org/archives/xorg-announce/2026-June/003702.html https://redhat.atlassian.net/browse/PSIRTSUPT-16950

CVSS v3.1

Source Entity [email protected]

Severity MEDIUM

5.5

Attack Vector

LOCAL

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns