SEPTEMBER 26, 2026
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Case File

CVE-2026-33999

HIGH · CVSS 7.8 EPSS 0.38%

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2026-04-23 · Last synced 2026-08-04

CyberRota Analysis

This is a high severity vulnerability with a CVSS score of 7.8. It may be remotely exploitable. It may lead to a denial-of-service condition.

CVE
CVE-2026-33999
Severity
HIGH
CVSS
7.8
EPSS
0.38%

Original NVD 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.