CVE-2026-34003
Xorg: xwayland: x.org x server: information exposure and denial of service via out-of-bounds memory access
Description
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.
INFO
Published Date :
April 23, 2026, 4:16 p.m.
Last Modified :
June 2, 2026, 10:16 a.m.
Remotely Exploit :
No
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-34003
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 | HIGH | 53f830b8-0a3f-465b-8143-3b8a9948e749 | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update X.Org X server to the latest secure version.
- Apply relevant security patches for XKB validation.
- Validate server configuration for XKB settings.
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-2026-34003.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-34003 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-2026-34003
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-2026-34003 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-34003 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.
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CVE Modified by [email protected]
Jun. 02, 2026
Action Type Old Value New Value Added Reference https://access.redhat.com/errata/RHSA-2026:22424 -
CVE Modified by [email protected]
May. 28, 2026
Action Type Old Value New Value Added Reference https://access.redhat.com/errata/RHSA-2026:21715 Added Reference https://access.redhat.com/errata/RHSA-2026:21741 Added Reference https://access.redhat.com/errata/RHSA-2026:21742 -
CVE Modified by [email protected]
May. 28, 2026
Action Type Old Value New Value Added Reference https://access.redhat.com/errata/RHSA-2026:21712 Added Reference https://access.redhat.com/errata/RHSA-2026:21716 Added Reference https://access.redhat.com/errata/RHSA-2026:21718 -
CVE Modified by [email protected]
May. 28, 2026
Action Type Old Value New Value Added Reference https://access.redhat.com/errata/RHSA-2026:21699 -
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 Added Reference https://access.redhat.com/errata/RHSA-2026:19344 -
CVE Modified by [email protected]
May. 19, 2026
Action Type Old Value New Value Added Reference https://access.redhat.com/errata/RHSA-2026:19125 Added Reference https://access.redhat.com/errata/RHSA-2026:19343 -
CVE Modified by [email protected]
May. 04, 2026
Action Type Old Value New Value Added Reference https://access.redhat.com/errata/RHSA-2026:13414 -
CVE Modified by [email protected]
Apr. 29, 2026
Action Type Old Value New Value Added Reference https://access.redhat.com/errata/RHSA-2026:11656 -
CVE Modified by [email protected]
Apr. 29, 2026
Action Type Old Value New Value Added Reference https://access.redhat.com/errata/RHSA-2026:11692 -
CVE Modified by [email protected]
Apr. 28, 2026
Action Type Old Value New Value Added Reference https://access.redhat.com/errata/RHSA-2026:11388 -
CVE Modified by [email protected]
Apr. 28, 2026
Action Type Old Value New Value Added Reference https://access.redhat.com/errata/RHSA-2026:11369 -
CVE Modified by [email protected]
Apr. 28, 2026
Action Type Old Value New Value Added Reference https://access.redhat.com/errata/RHSA-2026:11352 -
CVE Modified by [email protected]
Apr. 27, 2026
Action Type Old Value New Value Added Reference https://access.redhat.com/errata/RHSA-2026:10739 -
New CVE Received by [email protected]
Apr. 23, 2026
Action Type Old Value New Value Added Description 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. Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-125 Added Reference https://access.redhat.com/security/cve/CVE-2026-34003 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2451113