CVE-2026-34002CRITICAL 6.1EPSS p31.3%

CVE-2026-34002CVE-2026-34002

x.org / x_server

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.

Scoring

CVSS 3.16.1 (CRITICAL)
VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L
EPSS0.40% probability of exploitation · percentile 31.3% · 2026-06-19T12:03:05Z
Published2026-05-05
Last modified2026-06-08

Underlying weaknesses· 1

CWE-805

References

  1. https://access.redhat.com/errata/RHSA-2026:20547
  2. https://access.redhat.com/errata/RHSA-2026:20555
  3. https://access.redhat.com/errata/RHSA-2026:20557
  4. https://access.redhat.com/errata/RHSA-2026:20558
  5. https://access.redhat.com/errata/RHSA-2026:20560
  6. https://access.redhat.com/errata/RHSA-2026:20561
  7. https://access.redhat.com/errata/RHSA-2026:20562
  8. https://access.redhat.com/errata/RHSA-2026:20563

1

TypeTargetConfidenceTier
WeaknessBuffer Access with Incorrect Length Valuecwe-8050%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.