vulntracker.iovulntracker.io
© 2026 vulntracker.io

CVE-2026-50263

Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: use-after-free information disclosure in createsaverwindow()

MEDIUM
5.5
CVSS Score
Published: June 5, 2026 at 10:36 AM UTC
Updated: September 28, 2026 at 11:56 AM UTC
3 products affected across 2 vendorsEnterprise LinuxX serverXwayland

Using Red Hat Enterprise Linux 10 by Red Hat?

Get instant alerts when new vulnerabilities affect Red Hat Enterprise Linux 10 - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Start FreeSign In
Severity
MEDIUM5.5
Exploit prediction
EPSS 0.1%
SSVC
No known exploit

Description

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Enterprise Linux· Red Hatrpm
95%
10.07.08.09.0
Vendor states this is fixed in 0:1.1.0-25.el6_10.18 (unaffected)
Vendor states this is fixed in 0:1.11.0-8.el8_4.16 (unaffected)
Vendor states this is fixed in 0:1.12.0-14.el9_2.15 (unaffected)
Vendor states this is fixed in 0:1.12.0-15.el8_8.18 (unaffected)
Vendor states this is fixed in 0:1.12.0-6.el8_6.18 (unaffected)
Vendor states this is fixed in 0:1.13.1-8.el9_4.10 (unaffected)
Vendor states this is fixed in 0:1.14.1-11.el9_6 (unaffected)
Vendor states this is fixed in 0:1.15.0-10.el8_10 (unaffected)
Vendor states this is fixed in 0:1.15.0-7.el9_8.2 (unaffected)
Vendor states this is fixed in 0:1.20.10-5.el8_4 (unaffected)
Vendor states this is fixed in 0:1.20.11-19.el8_8 (unaffected)
Vendor states this is fixed in 0:1.20.11-21.el9_2 (unaffected)
Vendor states this is fixed in 0:1.20.11-28.el8_10.2 (unaffected)
Vendor states this is fixed in 0:1.20.11-29.el9_4 (unaffected)
Vendor states this is fixed in 0:1.20.11-34.el9_6 (unaffected)
Vendor states this is fixed in 0:1.20.11-34.el9_8.2 (unaffected)
Vendor states this is fixed in 0:1.20.11-8.el8_6 (unaffected)
Vendor states this is fixed in 0:1.20.4-35.el7_9 (unaffected)
Vendor states this is fixed in 0:1.8.0-36.el7_9.5 (unaffected)
Vendor states this is fixed in 0:21.1.3-10.el9_2.1 (unaffected)
Vendor states this is fixed in 0:21.1.3-13.el8_8.1 (unaffected)
Vendor states this is fixed in 0:21.1.3-2.el8_6.7 (unaffected)
Vendor states this is fixed in 0:21.1.3-20.el8_10.2 (unaffected)
Vendor states this is fixed in 0:22.1.9-8.el9_4.1 (unaffected)
Vendor states this is fixed in 0:23.2.7-6.el9_6.1 (unaffected)
Vendor states this is fixed in 0:24.1.5-6.el10_0.1 (unaffected)
Vendor states this is fixed in 0:24.1.9-4.el10_2.2 (unaffected)
Vendor states this is fixed in 0:24.1.9-4.el9_8.2 (unaffected)
Vendor states this is fixed in 6 (unknown)
X server· X Org
95%
v < 21.1.23
Affected range stops below 21.1.23, so it looks safe — our inference, not a vendor statement
Xwayland· X Org
95%
v < 24.1.12
Affected range stops below 24.1.12, so it looks safe — our inference, not a vendor statement

References (33)

VDB Entryx_refsource_REDHATThird Party Advisory
Source: cverecord
https://access.redhat.com/security/cve/CVE-2026-50263
Issue Trackingx_refsource_REDHATThird Party Advisory
Source: cverecord
https://bugzilla.redhat.com/show_bug.cgi?id=2485388
Patch
Source: cverecord
https://gitlab.freedesktop.org/xorg/xserver/-/commit/ecc634f1b2f7aa473d3a267eada98c4918bf9e05
Mailing ListVendor Advisory
Source: cverecord
https://lists.x.org/archives/xorg-announce/2026-June/003702.html
Permissions Required
Source: cverecord
https://redhat.atlassian.net/browse/PSIRTSUPT-16950
Vendor Advisoryx_refsource_REDHAT
Source: cverecord
https://access.redhat.com/errata/RHSA-2026:26562
Vendor Advisoryx_refsource_REDHAT
Source: cverecord
https://access.redhat.com/errata/RHSA-2026:26590
Vendor Advisoryx_refsource_REDHAT
Source: cverecord
https://access.redhat.com/errata/RHSA-2026:26610

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.5MEDIUMredhat
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-416

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create accountSign in
Free plan, no card