Vulnerability DatabaseCVE-2026-50263
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CVE-2026-50263
Published:June 05, 2026
Updated:June 07, 2026
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.
Affected Packages
https://gitlab.freedesktop.org/xorg/xserver.git (SCM_GIT):
Affected version(s) >=add-Xi <xorg-server-21.1.23
Fix Suggestion:
Update to version xorg-server-21.1.23
https://gitlab.freedesktop.org/xorg/xserver.git (SCM_GIT):
Affected version(s) >=add-Xi <xwayland-24.1.12
Fix Suggestion:
Update to version xwayland-24.1.12
Related Resources (5)
https://bugzilla.redhat.com/show_bug.cgi?id=2485388
https://lists.x.org/archives/xorg-announce/2026-June/003702.html
https://gitlab.freedesktop.org/xorg/xserver/-/commit/ecc634f1b2f7aa473d3a267eada98c4918bf9e05
https://access.redhat.com/security/cve/CVE-2026-50263
https://redhat.atlassian.net/browse/PSIRTSUPT-16950
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CVSS v4
Base Score:
6.8
Attack Vector
LOCAL
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.5
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Use After Free
CWE-416
EPSS
Base Score:
0.01