CVE-2026-50263

Public on 2026-06-05
Modified on 2026-06-08
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.
Severity
Medium severity
Medium
See what this means
CVSS v3 Base Score
5.5
See breakdown

Affected Packages

Platform Package Release Date Advisory Status
Amazon Linux 2023 tigervnc Pending Fix
Amazon Linux 2 - Core xorg-x11-server Pending Fix
Amazon Linux 2023 xorg-x11-server Pending Fix
Amazon Linux 2023 xorg-x11-server-Xwayland Pending Fix

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References

FAQs regarding Amazon Linux ALAS/CVE Severity Red Hat: CVE-2026-50263 Mitre: CVE-2026-50263