---
id: CVE-2026-40106
title: >-
  Wazuh is a free and open source platform used for threat prevention,
  detection, and response
summary: >-
  Wazuh is a free and open source platform used for threat prevention,
  detection, and response. Versions 4.6.0 and above prior to 4.14.5 contain a
  heap-based buffer overflow vulnerability in the syscheck component of the
  Wazuh agent for Wi…
severity: medium
cvss: 4.7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-122
vendor: wazuh
product: wazuh
affected:
  - 'wazuh >= 4.6.0, < 4.14.5'
patched:
  - wazuh 4.14.5
published: '2026-07-17'
updated: '2026-07-20'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-40106'
references:
  - url: 'https://github.com/wazuh/wazuh/security/advisories/GHSA-qvrc-pcfc-jhqc'
    label: security-advisories@github.com
  - url: 'https://github.com/wazuh/wazuh/security/advisories/GHSA-qvrc-pcfc-jhqc'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00134
epssPercentile: 0.0324
ingestedAt: '2026-07-20T02:36:03.308Z'
---

## Overview

Wazuh is a free and open source platform used for threat prevention, detection, and response. Versions 4.6.0 and above prior to 4.14.5 contain a heap-based buffer overflow vulnerability in the syscheck component of the Wazuh agent for Windows. When expanding registry paths containing wildcards (* or ?), the agent allocates a fixed-size heap buffer of 256 bytes (OS_SIZE_256). By creating a registry subkey with a maximum allowed length (255 characters) inside a monitored path, a low-privileged local attacker can force an out-of-bounds write during string concatenation. Since wazuh-agent.exe runs as NT AUTHORITY\SYSTEM, this can lead to a silent Denial of Service (blinding the agent) or potentially Local Privilege Escalation (LPE). This issue has been fixed in version 4.14.5.

## Affected

- `wazuh >= 4.6.0, < 4.14.5`

## Remediation

Upgrade past the affected range:

- `wazuh 4.14.5`