RHSA-2026:11656 — Security Advisory
Red Hat Security Advisory: xorg-x11-server-Xwayland security update
Severity
ImportantRed Hat Product Security
Products
Official CSAF product identity
Published · April 29, 2026
Updated · October 3, 2026
Topic
An update for xorg-x11-server-Xwayland is now available for Red Hat Enterprise Linux 8.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Description
Xwayland is an X server for running X clients under Wayland.
Security Fix(es):
-
xorg: xwayland: X.Org X server: Denial of Service via integer underflow in XKB compatibility map handling (CVE-2026-33999)
-
xorg: xwayland: X.Org X server: Use-after-free vulnerability leads to server crash and potential memory corruption (CVE-2026-34001)
-
xorg: xwayland: X.Org X server: Information exposure and denial of service via out-of-bounds memory access (CVE-2026-34003)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.