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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.

PUBLISHED Reserved 2026-06-04 | Published 2026-06-05 | Updated 2026-06-08 | Assigner redhat




MEDIUM: 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Problem types

Use After Free

Product status

Default status
affected

Default status
unknown

Default status
affected

Default status
affected

Default status
affected

Default status
affected

Default status
affected

Timeline

2026-05-15:Reported to Red Hat.
2026-06-02:Made public.

Credits

Upstream acknowledges Anonymous (Trend Micro Zero Day Initiative) as the original reporter.

References

access.redhat.com/security/cve/CVE-2026-50263 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2485388 (RHBZ#2485388) issue-tracking

gitlab.freedesktop.org/...f1b2f7aa473d3a267eada98c4918bf9e05

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

redhat.atlassian.net/browse/PSIRTSUPT-16950

cve.org (CVE-2026-50263)

nvd.nist.gov (CVE-2026-50263)

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