CVE-2026-34002
MEDIUMX.Org X Server Xwayland - XKB Modifier Map Out-of-Bounds Read
Title source: manualDescription
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.
References (2)
Core 2
Core References
Vdb Entry, X_Refsource_Redhat vdb-entry
x_refsource_redhat
https://access.redhat.com/security/cve/CVE-2026-34002
Issue Tracking, X_Refsource_Redhat issue-tracking
x_refsource_redhat
RHBZ#2451112
https://bugzilla.redhat.com/show_bug.cgi?id=2451112
Scores
CVSS v3
6.1
EPSS
0.0003
EPSS Percentile
8.6%
Attack Vector
LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-805
Status
published
Products (11)
Red Hat/Red Hat Enterprise Linux 10
Red Hat/Red Hat Enterprise Linux 6
Red Hat/Red Hat Enterprise Linux 7
Red Hat/Red Hat Enterprise Linux 8
Red Hat/Red Hat Enterprise Linux 9
redhat/enterprise_linux
6.0
redhat/enterprise_linux
7.0
redhat/enterprise_linux
8.0
redhat/enterprise_linux
9.0
redhat/enterprise_linux
10.0
... and 1 more
Published
May 05, 2026
Tracked Since
May 05, 2026