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CVE-2026-34002

Xorg: xwayland: x.org x server: information disclosure or denial of service via out-of-bounds read in xkb modifier map handling

No known exploitation. EPSS puts it in the 42nd percentile. Fixed versions are out.

CVSS 3.16.1MediumEPSS percentile42nd0.5% chance in 30 daysCISA KEVNot listedNo confirmed exploitation
No public exploit knownFix5 products4 fixed builds listed below
Check it yourself

OpenVAS · 54 checks

e.g. OID 1.3.6.1.4.1.25623.1.0.133345

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Published Updated Sources: CVE.org, NVD, BDU

NVD CVE.org

What to do

Find your product and version, then upgrade to the build on the right.

  • Red Hat Enterprise Linux 10.0 Extended Update SupportFixed builds0:24.1.5-6.el10_0Stated by: CVE record
  • Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSIONFixed builds0:1.1.0-25.el6_10.16Stated by: CVE record
  • Red Hat Enterprise Linux 7 Extended Lifecycle SupportFixed builds0:1.20.4-34.el7_9Stated by: CVE record
  • Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportFixed builds0:1.20.10-4.el8_4Stated by: CVE record
  • Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnFixed builds0:1.20.10-4.el8_4Stated by: CVE record

Versions as the sources state them. 12 more products have version data. Full version matrix after sign-in

Check it yourselfA free OpenVAS check exists for this CVE. Run it against your hosts.Is your organisation exposed?Request an assessment to establish which checks fit your systems.

What it is

From the CVE record

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.

In plain language

No plain-language summary for this CVE yet.

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

EPSS42nd
CISA KEV

Not in the catalog. CISA has not confirmed exploitation.

Public exploits

No public exploit or proof of concept found in the sources we track.

EPSS

0.5% chance of exploitation activity in the next 30 days, which ranks it in the 42nd percentile of scored CVEs.

Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.

Lifecycle

12 events over 184 days, from the signal feeds we watch.

  1. Patch availableworkaround available, record updated
  2. Patch availableworkaround available, record updated
  3. OpenVAS check added
  4. Patch availableworkaround available, record updated
  5. Publishedweakness classified

Affected products

And 12 more affected products. See all after sign-in

Technical detail

CVSS 3.1 vector

Open in the CVSS calculator

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L

Scored 6.1 by NVD.

How it is reached

  • Attack Vector LocalRequires local access to the vulnerable system (e.g. local login, malicious file)
  • Attack Complexity LowNo special conditions — the attack can be reliably reproduced
  • Privileges Required LowRequires basic user-level privileges
  • User Interaction NoneNo user interaction needed — fully automated exploitation

Scope

  • Scope UnchangedImpact is limited to the vulnerable component itself

Impact if exploited

  • Confidentiality HighTotal information disclosure — all data in the component is compromised
  • Integrity NoneNo integrity impact
  • Availability LowReduced performance or intermittent disruption of service

Weaknesses

Sources

References in the record

And 27 more references. See all after sign-in

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