CVE-2026-34002

MEDIUM

6.1

CVSS v3

Description

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.

CWE-805

How to fix

Remediation Available

xorg-serverDebian

Fixed in:2:1.20.11-1+deb11u18CVE-2026-34002

Fixed in:2:21.1.7-3+deb12u12CVE-2026-34002

Fixed in:2:21.1.16-1.3+deb13u2CVE-2026-34002

Fixed in:2:21.1.22-1CVE-2026-34002

tigervncRocky

Fixed in:0:1.1.0-25.el6_10.16RHSA-2026:23496

Fixed in:0:1.8.0-36.el7_9.4RHSA-2026:22456

tigervncRed Hat / RHEL

Fixed in:0:1.1.0-25.el6_10.16RHSA-2026:23496

Fixed in:0:1.8.0-36.el7_9.4RHSA-2026:22456

Fixed in:0:1.8.0-36.el7_9.4.ppc64RHSA-2026:22456

tigervnc-debuginfoRocky

Fixed in:0:1.1.0-25.el6_10.16RHSA-2026:23496

Fixed in:0:1.8.0-36.el7_9.4.ppc64RHSA-2026:22456

Fixed in:0:1.8.0-36.el7_9.4RHSA-2026:22456

Fixed in:0:1.11.0-8.el8_4.15RHSA-2026:23254

tigervnc-debuginfoRed Hat / RHEL

Fixed in:0:1.1.0-25.el6_10.16RHSA-2026:23496

Fixed in:0:1.8.0-36.el7_9.4.ppc64RHSA-2026:22456

Fixed in:0:1.8.0-36.el7_9.4RHSA-2026:22456

Fixed in:0:1.12.0-15.el8_8.17RHSA-2026:23255

tigervnc-debugsourceRed Hat / RHEL

Fixed in:0:1.11.0-8.el8_4.15RHSA-2026:23254

Fixed in:0:1.12.0-15.el8_8.17RHSA-2026:23255

Fixed in:0:1.12.0-6.el8_6.17RHSA-2026:24341

Fixed in:0:1.11.0-22.el9_0.17RHSA-2026:21741

Fixed in:0:1.12.0-14.el9_2.14RHSA-2026:20576

Fixed in:0:1.14.1-10.el9_6RHSA-2026:22424

tigervnc-debugsourceRocky

Fixed in:0:1.11.0-8.el8_4.15RHSA-2026:23254

Fixed in:0:1.12.0-6.el8_6.17RHSA-2026:24341

Fixed in:0:1.12.0-15.el8_8.17RHSA-2026:23255

Fixed in:0:1.13.1-8.el9_4.9RHSA-2026:20575

Fixed in:0:1.11.0-22.el9_0.17RHSA-2026:21741

Fixed in:0:1.13.1-8.el9_4.9RHSA-2026:20575

tigervnc-iconsRocky

Fixed in:0:1.8.0-36.el7_9.4RHSA-2026:22456

Fixed in:0:1.12.0-6.el8_6.17RHSA-2026:24341

Fixed in:0:1.12.0-15.el8_8.17RHSA-2026:23255

Fixed in:0:1.11.0-8.el8_4.15RHSA-2026:23254

Fixed in:0:1.11.0-22.el9_0.17RHSA-2026:21741

Fixed in:0:1.14.1-10.el9_6RHSA-2026:22424

Fixed in:0:1.12.0-14.el9_2.14RHSA-2026:20576

Fixed in:0:1.13.1-8.el9_4.9RHSA-2026:20575

tigervnc-iconsRed Hat / RHEL

Fixed in:0:1.8.0-36.el7_9.4RHSA-2026:22456

Fixed in:0:1.11.0-8.el8_4.15RHSA-2026:23254

Fixed in:0:1.12.0-15.el8_8.17RHSA-2026:23255

Fixed in:0:1.12.0-6.el8_6.17RHSA-2026:24341

Fixed in:0:1.11.0-22.el9_0.17RHSA-2026:21741

Fixed in:0:1.12.0-14.el9_2.14RHSA-2026:20576

Fixed in:0:1.14.1-10.el9_6RHSA-2026:22424

Fixed in:0:1.13.1-8.el9_4.9RHSA-2026:20575

tigervnc-licenseRed Hat / RHEL

Fixed in:0:1.8.0-36.el7_9.4RHSA-2026:22456

Fixed in:0:1.11.0-8.el8_4.15RHSA-2026:23254

Fixed in:0:1.12.0-15.el8_8.17RHSA-2026:23255

Fixed in:0:1.12.0-6.el8_6.17RHSA-2026:24341

Fixed in:0:1.12.0-14.el9_2.14RHSA-2026:20576

Fixed in:0:1.14.1-10.el9_6RHSA-2026:22424

Fixed in:0:1.11.0-22.el9_0.17RHSA-2026:21741

Fixed in:0:1.13.1-8.el9_4.9RHSA-2026:20575

tigervnc-licenseRocky

Fixed in:0:1.8.0-36.el7_9.4RHSA-2026:22456

Fixed in:0:1.11.0-8.el8_4.15RHSA-2026:23254

Fixed in:0:1.12.0-6.el8_6.17RHSA-2026:24341

Fixed in:0:1.12.0-15.el8_8.17RHSA-2026:23255

Fixed in:0:1.12.0-14.el9_2.14RHSA-2026:20576

Fixed in:0:1.13.1-8.el9_4.9RHSA-2026:20575

Fixed in:0:1.11.0-22.el9_0.17RHSA-2026:21741

Fixed in:0:1.14.1-10.el9_6RHSA-2026:22424

tigervnc-selinuxRocky

Fixed in:0:1.12.0-6.el8_6.17RHSA-2026:24341

Fixed in:0:1.12.0-15.el8_8.17RHSA-2026:23255

Fixed in:0:1.11.0-8.el8_4.15RHSA-2026:23254

Fixed in:0:1.14.1-10.el9_6RHSA-2026:22424

Fixed in:0:1.12.0-14.el9_2.14RHSA-2026:20576

Fixed in:0:1.11.0-22.el9_0.17RHSA-2026:21741

Fixed in:0:1.13.1-8.el9_4.9RHSA-2026:20575

tigervnc-selinuxRed Hat / RHEL

Fixed in:0:1.11.0-8.el8_4.15RHSA-2026:23254

Fixed in:0:1.12.0-15.el8_8.17RHSA-2026:23255

Fixed in:0:1.12.0-6.el8_6.17RHSA-2026:24341

Fixed in:0:1.11.0-22.el9_0.17RHSA-2026:21741

Fixed in:0:1.12.0-14.el9_2.14RHSA-2026:20576

Fixed in:0:1.13.1-8.el9_4.9RHSA-2026:20575

Fixed in:0:1.14.1-10.el9_6RHSA-2026:22424

tigervnc-serverRed Hat / RHEL

Fixed in:0:1.1.0-25.el6_10.16RHSA-2026:23496

Fixed in:0:1.8.0-36.el7_9.4RHSA-2026:22456

Fixed in:0:1.8.0-36.el7_9.4.ppc64RHSA-2026:22456

Fixed in:0:1.8.0-36.el7_9.4RHSA-2026:22456

Fixed in:0:1.12.0-15.el8_8.17RHSA-2026:23255

tigervnc-serverRocky

Fixed in:0:1.1.0-25.el6_10.16RHSA-2026:23496

Fixed in:0:1.8.0-36.el7_9.4RHSA-2026:22456

Fixed in:0:1.8.0-36.el7_9.4.ppc64RHSA-2026:22456

Fixed in:0:1.8.0-36.el7_9.4RHSA-2026:22456

Fixed in:0:1.11.0-8.el8_4.15RHSA-2026:23254

tigervnc-server-appletRed Hat / RHEL

Fixed in:0:1.1.0-25.el6_10.16RHSA-2026:23496

Fixed in:0:1.8.0-36.el7_9.4RHSA-2026:22456

tigervnc-server-appletRocky

Fixed in:0:1.1.0-25.el6_10.16RHSA-2026:23496

Fixed in:0:1.8.0-36.el7_9.4RHSA-2026:22456

tigervnc-server-debuginfoRocky

Fixed in:0:1.11.0-8.el8_4.15RHSA-2026:23254

Fixed in:0:1.12.0-6.el8_6.17RHSA-2026:24341

Fixed in:0:1.12.0-15.el8_8.17RHSA-2026:23255

Fixed in:0:1.11.0-22.el9_0.17RHSA-2026:21741

Fixed in:0:1.14.1-10.el9_6RHSA-2026:22424

Fixed in:0:1.13.1-8.el9_4.9RHSA-2026:20575

Fixed in:0:1.14.1-10.el9_6RHSA-2026:22424

tigervnc-server-debuginfoRed Hat / RHEL

Fixed in:0:1.12.0-6.el8_6.17RHSA-2026:24341

Fixed in:0:1.12.0-15.el8_8.17RHSA-2026:23255

Fixed in:0:1.11.0-8.el8_4.15RHSA-2026:23254

Fixed in:0:1.11.0-22.el9_0.17RHSA-2026:21741

Fixed in:0:1.14.1-10.el9_6RHSA-2026:22424

tigervnc-server-minimalRocky

Fixed in:0:1.8.0-36.el7_9.4RHSA-2026:22456

Fixed in:0:1.8.0-36.el7_9.4.ppc64RHSA-2026:22456

Fixed in:0:1.8.0-36.el7_9.4RHSA-2026:22456

Fixed in:0:1.11.0-8.el8_4.15RHSA-2026:23254

Fixed in:0:1.12.0-15.el8_8.17RHSA-2026:23255

Fixed in:0:1.12.0-6.el8_6.17RHSA-2026:24341

Fixed in:0:1.12.0-15.el8_8.17RHSA-2026:23255

tigervnc-server-minimalRed Hat / RHEL

Fixed in:0:1.8.0-36.el7_9.4RHSA-2026:22456

Fixed in:0:1.8.0-36.el7_9.4.ppc64RHSA-2026:22456

Fixed in:0:1.11.0-8.el8_4.15RHSA-2026:23254

Fixed in:0:1.12.0-15.el8_8.17RHSA-2026:23255

Fixed in:0:1.12.0-6.el8_6.17RHSA-2026:24341

Fixed in:0:1.12.0-15.el8_8.17RHSA-2026:23255

tigervnc-server-minimal-debuginfoRed Hat / RHEL

Fixed in:0:1.12.0-15.el8_8.17RHSA-2026:23255

Fixed in:0:1.11.0-8.el8_4.15RHSA-2026:23254

Fixed in:0:1.12.0-6.el8_6.17RHSA-2026:24341

Fixed in:0:1.12.0-15.el8_8.17RHSA-2026:23255

Fixed in:0:1.11.0-22.el9_0.17RHSA-2026:21741

Fixed in:0:1.12.0-14.el9_2.14RHSA-2026:20576

tigervnc-server-minimal-debuginfoRocky

Fixed in:0:1.11.0-8.el8_4.15RHSA-2026:23254

Fixed in:0:1.12.0-6.el8_6.17RHSA-2026:24341

Fixed in:0:1.12.0-15.el8_8.17RHSA-2026:23255

Fixed in:0:1.13.1-8.el9_4.9RHSA-2026:20575

Fixed in:0:1.11.0-22.el9_0.17RHSA-2026:21741

Fixed in:0:1.14.1-10.el9_6RHSA-2026:22424

Fixed in:0:1.12.0-14.el9_2.14RHSA-2026:20576

tigervnc-server-moduleRocky

Fixed in:0:1.1.0-25.el6_10.16RHSA-2026:23496

Fixed in:0:1.8.0-36.el7_9.4.ppc64RHSA-2026:22456

Fixed in:0:1.8.0-36.el7_9.4RHSA-2026:22456

Fixed in:0:1.12.0-6.el8_6.17RHSA-2026:24341

Fixed in:0:1.12.0-15.el8_8.17RHSA-2026:23255

tigervnc-server-moduleRed Hat / RHEL

Fixed in:0:1.1.0-25.el6_10.16RHSA-2026:23496

Fixed in:0:1.8.0-36.el7_9.4.ppc64RHSA-2026:22456

Fixed in:0:1.8.0-36.el7_9.4RHSA-2026:22456

Fixed in:0:1.12.0-6.el8_6.17RHSA-2026:24341

Fixed in:0:1.12.0-15.el8_8.17RHSA-2026:23255

tigervnc-server-module-debuginfoRed Hat / RHEL

Fixed in:0:1.11.0-8.el8_4.15RHSA-2026:23254

Fixed in:0:1.12.0-6.el8_6.17RHSA-2026:24341

Fixed in:0:1.12.0-15.el8_8.17RHSA-2026:23255

Fixed in:0:1.12.0-14.el9_2.14RHSA-2026:20576

Fixed in:0:1.13.1-8.el9_4.9RHSA-2026:20575

Fixed in:0:1.12.0-14.el9_2.14RHSA-2026:20576

tigervnc-server-module-debuginfoRocky

Fixed in:0:1.12.0-6.el8_6.17RHSA-2026:24341

Fixed in:0:1.12.0-15.el8_8.17RHSA-2026:23255

Fixed in:0:1.11.0-8.el8_4.15RHSA-2026:23254

Fixed in:0:1.14.1-10.el9_6RHSA-2026:22424

Fixed in:0:1.13.1-8.el9_4.9RHSA-2026:20575

xorg-x11-serverRed Hat / RHEL

Fixed in:0:1.20.4-34.el7_9RHSA-2026:20590

Fixed in:0:1.20.11-18.el8_8RHSA-2026:21742

Fixed in:0:1.20.10-4.el8_4RHSA-2026:21715

Fixed in:0:1.20.11-7.el8_6RHSA-2026:21718

Fixed in:0:1.20.11-20.el9_2RHSA-2026:20557

Fixed in:0:1.20.11-13.el9_0RHSA-2026:21699

Fixed in:0:1.20.11-33.el9_6RHSA-2026:20558

Fixed in:0:1.20.11-28.el9_4RHSA-2026:20555

xorg-x11-serverRocky

Fixed in:0:1.20.4-34.el7_9RHSA-2026:20590

Fixed in:0:1.20.10-4.el8_4RHSA-2026:21715

Fixed in:0:1.20.11-7.el8_6RHSA-2026:21718

Fixed in:0:1.20.11-18.el8_8RHSA-2026:21742

Fixed in:0:1.20.11-33.el9_6RHSA-2026:20558

Fixed in:0:1.20.11-20.el9_2RHSA-2026:20557

Fixed in:0:1.20.11-28.el9_4RHSA-2026:20555

Fixed in:0:1.20.11-13.el9_0RHSA-2026:21699

xorg-x11-server-XdmxRed Hat / RHEL

Fixed in:0:1.20.4-34.el7_9RHSA-2026:20590

Fixed in:0:1.20.4-34.el7_9.ppc64RHSA-2026:20590

Fixed in:0:1.20.4-34.el7_9RHSA-2026:20590

Fixed in:0:1.20.11-7.el8_6RHSA-2026:21718

This vulnerability affects an unusually large number of packages. The highest-confidence fixes are shown above; the full list is longer. Check the referenced advisories for complete coverage.

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityLow

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

Exploit Intelligence

0.49%probability of exploitation in 30 days

40thpercentile

Moderate risk: more likely to be exploited than 40% of all known CVEs.

References

Related Vulnerabilities

Other CWE-805 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-14509	Critical	9.8	2.1%	-	Fix
CVE-2025-23319	High	8.1	1.6%	-	Fix
CVE-2024-24851	High	7.5	1.4%	-	-
CVE-2021-31885	High	7.5	1.2%	-	Fix
CVE-2023-20049	High	8.6	1.0%	-	Fix
CVE-2020-16101	High	7.5	1.0%	-	Fix

Common questions

How do I fix CVE-2026-34002?

Published advisories record a fix for 67 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2026-34002 being actively exploited?

Not that we know of. CVE-2026-34002 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.49% is the estimated probability that it will be exploited in the next 30 days. That is higher than 40% of all scored CVEs.

How severe is CVE-2026-34002?

CVE-2026-34002 has a CVSS v3 base score of 6.1, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-34002 affect?

Published advisories record a fix for xorg-server (Debian), tigervnc (Rocky), tigervnc (Red Hat / RHEL), tigervnc-debuginfo (Rocky), and 63 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2026-34002

Markdown

[![CVE-2026-34002](https://tridentstack.com/cve/badge/CVE-2026-34002.svg)](https://tridentstack.com/cve/CVE-2026-34002)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-34002"><img src="https://tridentstack.com/cve/badge/CVE-2026-34002.svg" alt="CVE-2026-34002"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

See how it works Start freeThis CVE lookup is free and always will be.

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-08.