CVE-2026-33999

HIGH

7.8

Description

A flaw was found in the X.Org X server. This integer underflow vulnerability, specifically in the XKB compatibility map handling, allows an attacker with local or remote X11 server access to trigger a buffer read overrun. This can lead to memory-safety violations and potentially a denial of service (DoS) or other severe impacts.

CVE Details

CVSS v3.1 Score7.8

SeverityHIGH

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

Attack VectorLOCAL

ComplexityLOW

Privileges RequiredLOW

User InteractionNONE

Published4/23/2026

Last Modified4/24/2026

Sourcenvd

Honeypot Sightings0

Weaknesses (CWE)

CWE-191

References

https://access.redhat.com/security/cve/CVE-2026-33999(secalert@redhat.com)

https://bugzilla.redhat.com/show_bug.cgi?id=2451106(secalert@redhat.com)

IOC Correlations

No correlations recorded

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