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.
SeverityMedium
CVSS5.5
Exploit probability—
Product
X.org Xwayland
PublishedJun 5, 2026
First seenJun 5, 2026
Weakness typeCWE-416Use after free
How to fix
Update
- x.org xwayland24.1.12 or later
- x.org x_server21.1.23 or later
Vendor advisories
- lists.x.org/archives/xorg-announce/2026-June/003702.html
- access.redhat.com/errata/RHSA-2026:26562
- access.redhat.com/errata/RHSA-2026:26566
- access.redhat.com/errata/RHSA-2026:26590
- access.redhat.com/errata/RHSA-2026:26610
- access.redhat.com/errata/RHSA-2026:26709
- access.redhat.com/errata/RHSA-2026:28923
- access.redhat.com/errata/RHSA-2026:29844
- access.redhat.com/errata/RHSA-2026:36083
- access.redhat.com/errata/RHSA-2026:36085
- access.redhat.com/errata/RHSA-2026:36086
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| x.org xwayland | v < 24.1.12 | 24.1.12 |
| x.org x_server | v < 21.1.23 | 21.1.23 |
| redhat enterprise_linux | 7.0, 8.0, 9.0, 10.0 | — |
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