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

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	2026-06-08	ALAS2-2026-3336	Fixed
Amazon Linux 2023	xorg-x11-server	2026-06-08	ALAS2023-2026-1790	Fixed
Amazon Linux 2023	xorg-x11-server-Xwayland	2026-06-08	ALAS2023-2026-1789	Fixed

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