What is RHSA-2026:11656?

RHSA-2026:11656 is a security advisory published by Red Hat Product Security with High severity. Red Hat Security Advisory: xorg-x11-server-Xwayland security update

Which CVE IDs does RHSA-2026:11656 cover?

RHSA-2026:11656 covers the following CVE IDs: CVE-2026-33999, CVE-2026-34001, CVE-2026-34003. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of RHSA-2026:11656?

RHSA-2026:11656 has a CVSS v3 base score of 7.8, published by Red Hat Product Security.

RHSA-2026:11656HighCVSS 7.8

Red Hat Security Advisory: xorg-x11-server-Xwayland security update

Vendor

Red Hat Product Security

Published

April 29, 2026

Last Modified

May 26, 2026

🔗 CVE IDs covered (3)

CVE-2026-33999 →CVE-2026-34001 →CVE-2026-34003 →

📋 Description

CVE-2026-33999 — xorg: xwayland: X.Org X server: Denial of Service via integer underflow in XKB compatibility map handling CVE-2026-34001 — xorg: xwayland: X.Org X server: Use-after-free vulnerability leads to server crash and potential memory corruption CVE-2026-34003 — xorg: xwayland: X.Org X server: Information exposure and denial of service via out-of-bounds memory access

🔗 References (6)

selfhttps://access.redhat.com/errata/RHSA-2026:11656
externalhttps://access.redhat.com/security/updates/classification/#important
externalhttps://bugzilla.redhat.com/show_bug.cgi?id=2451106
externalhttps://bugzilla.redhat.com/show_bug.cgi?id=2451109
externalhttps://bugzilla.redhat.com/show_bug.cgi?id=2451113
selfhttps://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_11656.json