CVE-2026-34000
Xwayland: xorg: x.org x server: information disclosure and denial of service via out-of-bounds read in xkb geometry processing.
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.
INFO
Published Date :
May 5, 2026, 4:16 p.m.
Last Modified :
May 26, 2026, 10:16 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-34000
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 53f830b8-0a3f-465b-8143-3b8a9948e749 | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | CRITICAL | [email protected] |
Solution
- Update the X.Org X server package.
- Apply vendor-supplied security patches.
- Restart the X server process.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-34000.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-34000 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-34000
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-34000 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-34000 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 26, 2026
Action Type Old Value New Value Added Reference https://access.redhat.com/errata/RHSA-2026:20547 Added Reference https://access.redhat.com/errata/RHSA-2026:20557 Added Reference https://access.redhat.com/errata/RHSA-2026:20576 -
CVE Modified by [email protected]
May. 26, 2026
Action Type Old Value New Value Added Reference https://access.redhat.com/errata/RHSA-2026:20555 -
CVE Modified by [email protected]
May. 26, 2026
Action Type Old Value New Value Added Reference https://access.redhat.com/errata/RHSA-2026:20558 Added Reference https://access.redhat.com/errata/RHSA-2026:20561 Added Reference https://access.redhat.com/errata/RHSA-2026:20563 Added Reference https://access.redhat.com/errata/RHSA-2026:20575 Added Reference https://access.redhat.com/errata/RHSA-2026:20590 -
CVE Modified by [email protected]
May. 26, 2026
Action Type Old Value New Value Added Reference https://access.redhat.com/errata/RHSA-2026:20560 -
CVE Modified by [email protected]
May. 26, 2026
Action Type Old Value New Value Added Reference https://access.redhat.com/errata/RHSA-2026:20562 -
CVE Modified by [email protected]
May. 20, 2026
Action Type Old Value New Value Added Reference https://access.redhat.com/errata/RHSA-2026:19342 -
Initial Analysis by [email protected]
May. 07, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Added CPE Configuration OR *cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* *cpe:2.3:a:x.org:x_server:-:*:*:*:*:*:*:* *cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:* Added Reference Type Red Hat, Inc.: https://access.redhat.com/security/cve/CVE-2026-34000 Types: Third Party Advisory Added Reference Type Red Hat, Inc.: https://bugzilla.redhat.com/show_bug.cgi?id=2451107 Types: Issue Tracking, Third Party Advisory -
New CVE Received by [email protected]
May. 05, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L Added CWE CWE-125 Added Reference https://access.redhat.com/security/cve/CVE-2026-34000 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2451107