CVE-2026-26204 Wazuh: Heap-based NULL WRITE Buffer Underflow in GetAlertData

Wazuh is a free and open source platform used for threat prevention, detection, and response. From version 1.0.0 to before version 4.14.4, a heap-based out-of-bounds WRITE occurs in GetAlertData, resulting in writing a NULL byte exactly 1 byte before the start of the buffer allocated by strdup. D...

CVE-2026-26204

Wazuh versions 1.0.0–4.14.3 are affected by a heap-based out-of-bounds write in GetAlertData that writes a NULL byte 1 byte before the start of the buffer allocated by strdup, due to an unsigned underflow. This corrupts heap metadata and can allow a compromised agent to cause denial of service or...

PT-2026-35961

Name of the Vulnerable Software and Affected Versions Wazuh versions 1.0.0 through 4.14.3 Description A heap-based out-of-bounds WRITE occurs in the GetAlertData function. This is caused by an unsigned integer underflow and pointer arithmetic wrapping, which results in a NULL byte being written...

Wazuh Log Collector Integer Underflow Local Privilege Escalation Vulnerability

This vulnerability allows local attackers to escalate privileges on affected installations of Wazuh. Log Injection is required to exploit this vulnerability but attack vectors may vary depending on the implementation. The specific flaw exists within the processing of the multilines log format. Th...