# CVE-2026-33999

> Vulnerability · severity: **HIGH** (CVSS 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.

## Key facts

- **CVE ID:** CVE-2026-33999
- **Published:** 2026-04-23
- **CVSS severity:** HIGH
- **CVSS base score:** 7.8
- **CWE codes:** CWE-191

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-33999

## Citation

> AI Analytics. CVE-2026-33999. Retrieved 2026-08-17 from https://api.ai-analytics.org/cve/CVE-2026-33999. Derived from NIST NVD. Licensed CC0.

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