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Medium 6.1Published May 5, 2026

CVE-2026-34000Xwayland: xorg: x.org x server: information disclosure and denial of service via out-of-bounds read in xkb geometry processing.

Updated under an hour ago ()

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It affects Red Hat Enterprise Linux 10.0 Extended Update Support and 8 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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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.

CVSS
6.1 MEDIUM (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L
Weakness (CWE)
CWE-125
Known exploited
Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days)
Not loaded for this CVE
Assigned by
redhat
NVD analysis
Modified
Record last updated
Jun 7, 2026
First seen by InfoSec Signals
Oct 9, 2026

Affected products

Affected products
from 0:24.1.5-6.el10_0 not affected
CNA record
from 0:1.1.0-25.el6_10.16 not affected
CNA record
from 0:1.20.10-4.el8_4 not affected
CNA record
from 0:1.20.10-4.el8_4 not affected
CNA record
from 0:21.1.3-2.el8_6.6 not affected
CNA record
from 0:21.1.3-2.el8_6.6 not affected
CNA record
Red Hat Red Hat Enterprise Linux 9
redhat:enterprise_linux
from 0:1.15.0-7.el9_8.1 not affected
CNA record
from 0:1.20.11-28.el9_4 not affected
CNA record
x.org x_server
x.org:x_server
all versions
NVD
redhat enterprise_linux
redhat:enterprise_linux
6.0; 7.0; 8.0; 9.0; 10.0
NVD

References

References

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.

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