CVE-2026-50263

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

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Published Jun 5, 2026 CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed
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.

Analysis

AI-generated

Technical impact

A use‑after‑free vulnerability exists in X.Org X server and Xwayland within the CreateSaverWindow() function. The flaw allows a client that can manipulate window attributes and force a screen saver to read memory after the object has already been freed. This results in disclosed data from the X server’s address space, a classic use‑after‑free (CWE‑416) that can reveal confidential information that the client cannot normally access.

Affected Systems

The affected products are X.Org X server and Xwayland on Red Hat Enterprise Linux 6, 7, 8, 9 and 10. No specific version numbers are listed in the advisory; any installation of these packages on the mentioned RHEL releases is potentially vulnerable.

Risk and Exploitability

The CVSS score of 5.5 indicates a moderate severity, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog. Exploitation requires a client that can connect to the X server, change window attributes, and force a screen saver. The lack of an EPSS score provides no current estimate of exploitation likelihood, but the described workflow makes the vulnerability usable for information disclosure by an attacker with X client access.

Remediation

Vendor Workaround

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

OpenCVE Recommended Actions

  • Install the Red Hat security update that patches X.Org X server and Xwayland for CVE‑2026‑50263, ensuring the underlying packages are upgraded to a fixed version.
  • After applying the update, restart the X server or reboot the system so that the patched binaries are loaded.
  • If possible, limit X client connections to trusted local users and disable remote X forwarding while the vulnerability remains active.

Generated by OpenCVE AI on June 5, 2026 at 12:21 UTC.

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-4737-1 xorg-server security update
Debian DLA Debian DLA DLA-4738-1 xorg-server security update
Debian DSA Debian DSA DSA-6370-1 xorg-server security update
References
Link Providers
https://access.redhat.com/errata/RHSA-2026:26562 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:26566 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:26590 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:26610 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:26709 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:28923 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:29844 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:36083 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:36085 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:36086 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:36087 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:36632 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:36633 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:36634 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:36768 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:36791 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:36792 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:36798 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:38502 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:38810 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:46377 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:46382 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:46385 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:46392 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:46456 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:46460 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:46473 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:49519 cve-icon cve-icon
https://access.redhat.com/security/cve/CVE-2026-50263 cve-icon cve-icon
https://bugzilla.redhat.com/show_bug.cgi?id=2485388 cve-icon cve-icon
https://gitlab.freedesktop.org/xorg/xserver/-/commit/ecc634f1b2f7aa473d3a267eada98c4918bf9e05 cve-icon cve-icon cve-icon
https://lists.x.org/archives/xorg-announce/2026-June/003702.html cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-50263 cve-icon
https://redhat.atlassian.net/browse/PSIRTSUPT-16950 cve-icon cve-icon cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-50263 cve-icon
History
Type Values Removed Values Added
CPEs cpe:/o:redhat:enterprise_linux:6
Type Values Removed Values Added
CPEs cpe:/o:redhat:rhel_els:6
References
Type Values Removed Values Added
References
Type Values Removed Values Added
References
Type Values Removed Values Added
References
Type Values Removed Values Added
References
Type Values Removed Values Added
First Time appeared Redhat enterprise Linux Eus
Redhat rhel Tus
CPEs cpe:/a:redhat:rhel_e4s:8.8::appstream
cpe:/a:redhat:rhel_tus:8.8::appstream
cpe:/o:redhat:enterprise_linux_eus:10.0
Vendors & Products Redhat enterprise Linux Eus
Redhat rhel Tus
References
Type Values Removed Values Added
CPEs cpe:/a:redhat:rhel_aus:8.4::appstream
cpe:/a:redhat:rhel_eus_long_life:8.4::appstream
References
Type Values Removed Values Added
First Time appeared Redhat rhel Aus
Redhat rhel Eus Long Life
CPEs cpe:/a:redhat:rhel_aus:8.6::appstream
cpe:/a:redhat:rhel_eus_long_life:8.6::appstream
Vendors & Products Redhat rhel Aus
Redhat rhel Eus Long Life
References
Type Values Removed Values Added
First Time appeared Redhat rhel Els
Redhat rhel Eus
CPEs cpe:/a:redhat:rhel_e4s:9.4::appstream
cpe:/a:redhat:rhel_eus:9.6::appstream
cpe:/a:redhat:rhel_eus:9.6::crb
cpe:/o:redhat:rhel_els:7
Vendors & Products Redhat rhel Els
Redhat rhel Eus
References
Type Values Removed Values Added
First Time appeared Redhat rhel E4s
CPEs cpe:/a:redhat:rhel_e4s:9.2::appstream
Vendors & Products Redhat rhel E4s
References
Type Values Removed Values Added
CPEs cpe:/o:redhat:enterprise_linux:9
References
Type Values Removed Values Added
CPEs cpe:/o:redhat:enterprise_linux:8
References
Type Values Removed Values Added
CPEs cpe:/o:redhat:enterprise_linux:10 cpe:/o:redhat:enterprise_linux:10.2
References
Type Values Removed Values Added
CPEs cpe:/a:redhat:enterprise_linux:8::crb
cpe:/a:redhat:enterprise_linux:9::appstream
cpe:/a:redhat:enterprise_linux:9::crb
References
Type Values Removed Values Added
CPEs cpe:/a:redhat:enterprise_linux:8::appstream
References
Type Values Removed Values Added
First Time appeared X.org
X.org x Server
X.org xwayland
CPEs cpe:2.3:a:x.org:x_server:*:*:*:*:*:*:*:*
cpe:2.3:a:x.org:xwayland:*:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
Vendors & Products X.org
X.org x Server
X.org xwayland
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}
Type Values Removed Values Added
References
Metrics threat_severity

None

 threat_severity

Moderate
Type Values Removed Values Added
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.
Title Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: use-after-free information disclosure in createsaverwindow()
First Time appeared Redhat
Redhat enterprise Linux
Weaknesses CWE-416
CPEs cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
References
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'}
Earlier changes (18)
Weaknesses

Sources

Status
PUBLISHED
Assigner
redhat
Published
Updated
Nov 5, 2026, 9:19 PM
Reserved
Jun 4, 2026, 2:55 PM

View source JSON

Updated
Jun 8, 2026, 4:01 PM

JSON

Status
Modified
Published
Jun 5, 2026, 12:16 PM
Modified
Nov 5, 2026, 10:18 PM

View source JSON

Severity
Moderate
Public date
Jun 2, 2026, 12:00 AM

View source Bugzilla JSON

Updated
Jun 7, 2026, 11:17 AM

JSON