CVE WatchJul 20, 2026

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 conta

CVSS

4.7

Medium

EPSS

0.1%

KEV

—

Exploit Today

0-100

Published: Jul 17, 2026 · Last modified: Jul 20, 2026 · CWE-122

EPSS · 30d

0.1%EPSS · 30 days0.1%

2026-08-042026-08-31

Technical 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.

Official references

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