CVE-2026-40106

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.

• CWE-122

• https://github.com/wazuh/wazuh/security/advisories/GHSA-qvrc-pcfc-jhqcExploit, Vendor Advisory
• https://github.com/wazuh/wazuh/security/advisories/GHSA-qvrc-pcfc-jhqcExploit, Vendor Advisory

Published

Jul 17, 2026

Last Modified

Jul 20, 2026

Status

Analyzed

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