# CVE-2026-34001

> Vulnerability · severity: **HIGH** (CVSS 7.8).

## Description

A flaw was found in the X.Org X server. This use-after-free vulnerability occurs in the XSYNC fence triggering logic, specifically within the miSyncTriggerFence() function. An attacker with access to the X11 server can exploit this without user interaction, leading to a server crash and potentially enabling memory corruption. This could result in a denial of service or further compromise of the system.

## Key facts

- **CVE ID:** CVE-2026-34001
- **Published:** 2026-04-23
- **CVSS severity:** HIGH
- **CVSS base score:** 7.8
- **CWE codes:** CWE-825

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-34001

## Citation

> AI Analytics. CVE-2026-34001. Retrieved 2026-08-08 from https://api.ai-analytics.org/cve/CVE-2026-34001. Derived from NIST NVD. Licensed CC0.

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