CVE-2026-50263

medium

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.

References

Advisories
More

https://bugzilla.redhat.com/show_bug.cgi?id=2485388

https://access.redhat.com/security/cve/CVE-2026-50263

https://access.redhat.com/errata/RHSA-2026:29844

https://access.redhat.com/errata/RHSA-2026:28923

https://access.redhat.com/errata/RHSA-2026:26709

https://access.redhat.com/errata/RHSA-2026:26610

https://access.redhat.com/errata/RHSA-2026:26590

https://access.redhat.com/errata/RHSA-2026:26566

https://access.redhat.com/errata/RHSA-2026:26562

https://redhat.atlassian.net/browse/PSIRTSUPT-16950

https://lists.x.org/archives/xorg-announce/2026-June/003702.html

https://gitlab.freedesktop.org/xorg/xserver/-/commit/ecc634f1b2f7aa473d3a267eada98c4918bf9e05

Details

Source: Mitre, NVD

Published: 2026-06-05

Updated: 2026-06-25

Risk Information

CVSS v2

Base Score: 4.6

Vector: CVSS2#AV:L/AC:L/Au:S/C:C/I:N/A:N

Severity: Medium

CVSS v3

Base Score: 5.5

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