CVE-2026-34000
MEDIUMCVSS v3.1: 6.1 · EPSS: 0.0003 (9.6 percentile)
Source data as of:
At a glance
- Severity
- MEDIUM
- CVSS
- 6.1 v3.1 · NVD
- EPSS
- 0.0003 (9.6 percentile) · FIRST.org
- CISA KEV
- No
- Type
- Out-of-bounds Read · NVD CWE
- Attack conditions (CVSS vector)
- No user interaction · Source: NVD Vector
- Affected vendors
- x.org, redhat
- Published
- 2026-05-05 · Modified: 2026-06-02
- References
- Jump to references (8)
CVSS / EPSS / KEV
Source — CVSS: NVD · EPSS: FIRST.org · KEV: CISA. Data & Sources
Description
A flaw was found in the X.Org X server. This out-of-bounds read vulnerability in the XKB geometry processing, specifically within the `CheckSetGeom()` and `XkbAddGeomKeyAlias` functions, allows an attacker to read uninitialized or out-of-bounds memory. An attacker with a connection to the X11 server, either locally or remotely, can exploit this without user interaction. This could lead to the disclosure of memory contents or cause a denial of service by crashing the server.
References
Reference URLs as listed by NVD, grouped by a mechanical match on the link's host/pattern. Labels describe the link type only.
- Distro https://access.redhat.com/errata/RHSA-2026:19342
- Distro https://access.redhat.com/errata/RHSA-2026:20547
- Distro https://access.redhat.com/errata/RHSA-2026:20555
- Distro https://access.redhat.com/errata/RHSA-2026:20557
- Distro https://access.redhat.com/errata/RHSA-2026:20558
- Distro https://access.redhat.com/errata/RHSA-2026:20560
- Distro https://access.redhat.com/errata/RHSA-2026:20561
- Distro https://access.redhat.com/errata/RHSA-2026:20562