CVE-2026-26204

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. Due to unsigned integer underflow and pointer arithmetic wrapping, the write lands at offset -1 from the buffer, corrupting heap metadata. A malicious actor can potentially leverage this issue through a compromised agent to cause denial of service or heap corruption by injecting a specially crafted alert into the alerts log file monitored by wazuh-logcollector. This issue has been patched in version 4.14.4.

The following products are affected by CVE-2026-26204 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-26204.

URL	Resource
https://github.com/wazuh/wazuh/releases/tag/v4.14.4
https://github.com/wazuh/wazuh/security/advisories/GHSA-j4c7-hwjw-8857