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.

CVSS v3 4.7 MEDIUM

4.7^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.0 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity HIGH

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/wazuh/wazuh/security/advisories/GHSA-qvrc-pcfc-jhqc	Exploit Vendor Advisory
https://github.com/wazuh/wazuh/security/advisories/GHSA-qvrc-pcfc-jhqc	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:wazuh:wazuh:*:*:*:*:*:*:*:*

History

20 Jul 2026, 02:29

Type	Values Removed	Values Added
CPE		cpe:2.3:a:wazuh:wazuh::::::::
References	~~() https://github.com/wazuh/wazuh/security/advisories/GHSA-qvrc-pcfc-jhqc -~~	() https://github.com/wazuh/wazuh/security/advisories/GHSA-qvrc-pcfc-jhqc - Exploit, Vendor Advisory
First Time		Wazuh wazuh Wazuh

17 Jul 2026, 15:16

Type	Values Removed	Values Added
References	~~() https://github.com/wazuh/wazuh/security/advisories/GHSA-qvrc-pcfc-jhqc -~~	() https://github.com/wazuh/wazuh/security/advisories/GHSA-qvrc-pcfc-jhqc -

17 Jul 2026, 02:18

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-07-17 02:18

Updated : 2026-07-20 02:29

NVD link : CVE-2026-40106

Mitre link : CVE-2026-40106

CVE.ORG link : CVE-2026-40106

JSON object : View

Products Affected

wazuh

wazuh

CWE

CWE-122

Heap-based Buffer Overflow

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