CVE-2026-26204: Wazuh

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Wazuh Wazuh: from 1.0.0, before 4.14.4 (fixed in 4.14.4)

Published 2026-04-29. Last modified 2026-06-17.