--- id: CVE-2026-34003 title: >- Xorg: xwayland: x.org x server: information exposure and denial of service via out-of-bounds memory access summary: >- A flaw was found in the X.Org X server's XKB key types request validation. A local attacker could send a specially crafted request to the X server, leading to an out-of-bounds memory access vulnerability. This could result in the disclos… severity: high cvss: 7.8 cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H' cvssSource: cna cwe: - CWE-125 vendor: Red Hat product: xorg-x11-server-Xwayland affected: - xorg-x11-server-Xwayland (all versions) - xorg-x11-server-Xwayland (all versions) - xorg-x11-server-Xwayland (all versions) - tigervnc (all versions) - xorg-x11-server (all versions) - tigervnc (all versions) - xorg-x11-server-Xwayland (all versions) - xorg-x11-server (all versions) - tigervnc (all versions) - xorg-x11-server (all versions) - tigervnc (all versions) - xorg-x11-server (all versions) - tigervnc (all versions) - xorg-x11-server-Xwayland (all versions) - xorg-x11-server (all versions) - tigervnc (all versions) - tigervnc (all versions) - xorg-x11-server-Xwayland (all versions) - xorg-x11-server (all versions) - xorg-x11-server-Xwayland (all versions) - xorg-x11-server (all versions) - xorg-x11-server-Xwayland (all versions) - xorg-x11-server (all versions) - tigervnc (all versions) - xorg-x11-server-Xwayland (all versions) - xorg-x11-server (all versions) - tigervnc (all versions) - tigervnc (all versions) - xorg-x11-server-Xwayland (all versions) - xorg-x11-server (all versions) - tigervnc (all versions) - xorg-x11-server (all versions) - xorg-x11-server-Xwayland (all versions) - xorg-x11-server-Xwayland (all versions) - xorg-x11-server (all versions) - tigervnc (all versions) - xorg-x11-server-Xwayland (all versions) - xorg-x11-server (all versions) - tigervnc (all versions) - xorg-x11-server (all versions) - xorg-x11-server-Xwayland (all versions) - tigervnc (all versions) - xorg-x11-server (all versions) - xorg-x11-server-Xwayland (all versions) - tigervnc (all versions) - xorg-x11-server ssvc: exploitation: none automatable: 'no' technicalImpact: total timestamp: '2026-04-23T00:00:00+00:00' published: '2026-04-23' updated: '2026-11-04' sourceUpdated: '2026-11-04T22:25:14.222Z' source: CVEORG sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-34003' references: - url: 'https://access.redhat.com/errata/RHSA-2026:10739' label: 'RHSA-2026:10739' - url: 'https://access.redhat.com/errata/RHSA-2026:11352' label: 'RHSA-2026:11352' - url: 'https://access.redhat.com/errata/RHSA-2026:11369' label: 'RHSA-2026:11369' - url: 'https://access.redhat.com/errata/RHSA-2026:11388' label: 'RHSA-2026:11388' - url: 'https://access.redhat.com/errata/RHSA-2026:11656' label: 'RHSA-2026:11656' - url: 'https://access.redhat.com/errata/RHSA-2026:11692' label: 'RHSA-2026:11692' - url: 'https://access.redhat.com/errata/RHSA-2026:13414' label: 'RHSA-2026:13414' - url: 'https://access.redhat.com/errata/RHSA-2026:19125' label: 'RHSA-2026:19125' - url: 'https://access.redhat.com/errata/RHSA-2026:19342' label: 'RHSA-2026:19342' - url: 'https://access.redhat.com/errata/RHSA-2026:19343' label: 'RHSA-2026:19343' - url: 'https://access.redhat.com/errata/RHSA-2026:19344' label: 'RHSA-2026:19344' - url: 'https://access.redhat.com/errata/RHSA-2026:20547' label: 'RHSA-2026:20547' - url: 'https://access.redhat.com/errata/RHSA-2026:20555' label: 'RHSA-2026:20555' - url: 'https://access.redhat.com/errata/RHSA-2026:20557' label: 'RHSA-2026:20557' - url: 'https://access.redhat.com/errata/RHSA-2026:20558' label: 'RHSA-2026:20558' - url: 'https://access.redhat.com/errata/RHSA-2026:20560' label: 'RHSA-2026:20560' - url: 'https://access.redhat.com/errata/RHSA-2026:20561' label: 'RHSA-2026:20561' - url: 'https://access.redhat.com/errata/RHSA-2026:20562' label: 'RHSA-2026:20562' - url: 'https://access.redhat.com/errata/RHSA-2026:20563' label: 'RHSA-2026:20563' - url: 'https://access.redhat.com/errata/RHSA-2026:20575' label: 'RHSA-2026:20575' - url: 'https://access.redhat.com/errata/RHSA-2026:20576' label: 'RHSA-2026:20576' - url: 'https://access.redhat.com/errata/RHSA-2026:20590' label: 'RHSA-2026:20590' - url: 'https://access.redhat.com/errata/RHSA-2026:21699' label: 'RHSA-2026:21699' - url: 'https://access.redhat.com/errata/RHSA-2026:21712' label: 'RHSA-2026:21712' - url: 'https://access.redhat.com/errata/RHSA-2026:21715' label: 'RHSA-2026:21715' - url: 'https://access.redhat.com/errata/RHSA-2026:21716' label: 'RHSA-2026:21716' - url: 'https://access.redhat.com/errata/RHSA-2026:21718' label: 'RHSA-2026:21718' - url: 'https://access.redhat.com/errata/RHSA-2026:21741' label: 'RHSA-2026:21741' - url: 'https://access.redhat.com/errata/RHSA-2026:21742' label: 'RHSA-2026:21742' - url: 'https://access.redhat.com/errata/RHSA-2026:22424' label: 'RHSA-2026:22424' - url: 'https://access.redhat.com/errata/RHSA-2026:22456' label: 'RHSA-2026:22456' - url: 'https://access.redhat.com/errata/RHSA-2026:23254' label: 'RHSA-2026:23254' - url: 'https://access.redhat.com/errata/RHSA-2026:23255' label: 'RHSA-2026:23255' - url: 'https://access.redhat.com/errata/RHSA-2026:23496' label: 'RHSA-2026:23496' - url: 'https://access.redhat.com/errata/RHSA-2026:24341' label: 'RHSA-2026:24341' - url: 'https://access.redhat.com/security/cve/CVE-2026-34003' - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2451113' label: RHBZ#2451113 tags: - cve.org epss: 0.0025 epssPercentile: 0.16417 ingestedAt: '2026-11-05T21:36:00.644Z' --- ## Overview A flaw was found in the X.Org X server's XKB key types request validation. A local attacker could send a specially crafted request to the X server, leading to an out-of-bounds memory access vulnerability. This could result in the disclosure of sensitive information or cause the server to crash, leading to a Denial of Service (DoS). In certain configurations, higher impact outcomes may be possible. ## Affected - `xorg-x11-server-Xwayland (all versions)` - `xorg-x11-server-Xwayland (all versions)` - `xorg-x11-server-Xwayland (all versions)` - `tigervnc (all versions)` - `xorg-x11-server (all versions)` - `tigervnc (all versions)` - `xorg-x11-server-Xwayland (all versions)` - `xorg-x11-server (all versions)` - `tigervnc (all versions)` - `xorg-x11-server (all versions)` - `tigervnc (all versions)` - `xorg-x11-server (all versions)` - `tigervnc (all versions)` - `xorg-x11-server-Xwayland (all versions)` - `xorg-x11-server (all versions)` - `tigervnc (all versions)` - `tigervnc (all versions)` - `xorg-x11-server-Xwayland (all versions)` - `xorg-x11-server (all versions)` - `xorg-x11-server-Xwayland (all versions)` - `xorg-x11-server (all versions)` - `xorg-x11-server-Xwayland (all versions)` - `xorg-x11-server (all versions)` - `tigervnc (all versions)` - `xorg-x11-server-Xwayland (all versions)` - `xorg-x11-server (all versions)` - `tigervnc (all versions)` - `tigervnc (all versions)` - `xorg-x11-server-Xwayland (all versions)` - `xorg-x11-server (all versions)` - `tigervnc (all versions)` - `xorg-x11-server (all versions)` - `xorg-x11-server-Xwayland (all versions)` - `xorg-x11-server-Xwayland (all versions)` - `xorg-x11-server (all versions)` - `tigervnc (all versions)` - `xorg-x11-server-Xwayland (all versions)` - `xorg-x11-server (all versions)` - `tigervnc (all versions)` - `xorg-x11-server (all versions)` - `xorg-x11-server-Xwayland (all versions)` - `tigervnc (all versions)` - `xorg-x11-server (all versions)` - `xorg-x11-server-Xwayland (all versions)` - `tigervnc (all versions)` - `xorg-x11-server` ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges. ### Workarounds Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.