SEPTEMBER 7, 2026
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Case File

CVE-2026-40106

MEDIUM · CVSS 4.7 EPSS 0.13% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-07-17 · Last synced 2026-08-16

CyberRota Analysis

AI-Generated

The Wazuh agent for Windows, specifically versions 4.6.0 to 4.14.4, is vulnerable to a heap-based buffer overflow in its syscheck component, which can be exploited by low-privileged local attackers through crafted registry subkeys. This vulnerability may result in a Denial of Service, rendering the agent non-functional, or could allow for Local Privilege Escalation, as the agent operates with SYSTEM privileges. Organizations using affected versions should prioritize upgrading to version 4.14.5 to mitigate these risks.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-40106
Severity
MEDIUM
CVSS
4.7
EPSS
0.13%
Windows

Original NVD Description

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.

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