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Vulnerability · Published May 5, 2026 · Assigned by redhat

CVE-2026-34002Xorg: xwayland: x.org x server: information disclosure or denial of service via out-of-bounds read in xkb modifier map handling

Medium 6.1

In plain English

A medium-severity security flaw in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.1Medium
Exploit odds (30 days)0.5%top 57.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

A flaw was found in the X.Org X server. This vulnerability, an out-of-bounds read, affects the XKB (X Keyboard Extension) modifier map handling. An attacker with access to the X11 server can exploit this by sending a malformed request, which causes the server to read beyond its intended memory boundaries. This can lead to the exposure of sensitive information or cause the server to crash, resulting in a denial of service.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.23xorg-server21.1.22-r0ALPINE-CVE-2026-34002
Alpine:v3.24xorg-server21.1.22-r0ALPINE-CVE-2026-34002
Alpine:v3.23xwayland24.1.10-r0ALPINE-CVE-2026-34002
Alpine:v3.24xwayland24.1.10-r0ALPINE-CVE-2026-34002
Debian:12xorg-server2:21.1.7-3+deb12u12DEBIAN-CVE-2026-34002
Debian:13xorg-server2:21.1.16-1.3+deb13u2DEBIAN-CVE-2026-34002
Debian:14xorg-server2:21.1.22-1DEBIAN-CVE-2026-34002
Debian:12xwaylandno fix listedDEBIAN-CVE-2026-34002
Debian:13xwaylandno fix listedDEBIAN-CVE-2026-34002
Debian:14xwayland2:24.1.10-1DEBIAN-CVE-2026-34002
Ubuntu:22.04:LTSxorg-serverno fix listedUBUNTU-CVE-2026-34002
Ubuntu:24.04:LTSxorg-serverno fix listedUBUNTU-CVE-2026-34002
Ubuntu:25.10xorg-serverno fix listedUBUNTU-CVE-2026-34002
Ubuntu:26.04:LTSxorg-serverno fix listedUBUNTU-CVE-2026-34002
Ubuntu:22.04:LTSxwaylandno fix listedUBUNTU-CVE-2026-34002
Ubuntu:24.04:LTSxwaylandno fix listedUBUNTU-CVE-2026-34002
Ubuntu:25.10xwaylandno fix listedUBUNTU-CVE-2026-34002
Ubuntu:26.04:LTSxwaylandno fix listedUBUNTU-CVE-2026-34002

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support see references
Red Hat Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION see references
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support see references
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support see references
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On see references
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On see references
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On see references
Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service see references
Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service see references
Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service see references
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service see references
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service see references
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support see references
Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support see references

Weakness: CWE-805 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L

References