CVE-2026-34150: Wazuh: Heap buffer overflow in wazuh-analysisd via rootcheck event parsing

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-07-17 · updated 2026-07-20
Weakness: CWE-122

Description

Wazuh is a free and open source platform used for threat prevention, detection, and response. In versions 1.0.0 and above, prior to 4.14.5, a heap buffer overflow in wazuh-analysisd allows an unauthenticated remote attacker to crash the Wazuh manager's analysis engine, causing complete loss of SIEM alert processing. The attack exploits the default configuration shipped in the official wazuh/wazuh-docker deployment with default configuration. An attacker can enroll with authd without a password to obtain a valid agent ID and encryption key, connect to remoted over the Wazuh agent protocol, and inject rootcheck events containing {key: value} patterns longer than 30 bytes that trigger a sprintf overflow of a 30-byte buffer in W_JSON_ParseRootcheck, corrupting the heap and crashing wazuh-analysisd so that all alert processing silently stops while the dashboard and API keep showing stale data.

Affected products

wazuh: from 1.0.0 before 4.14.5 — fixed in 4.14.5

How to fix

Upgrade to a fixed version: wazuh 4.14.5. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2026-34150 or the next vulnerability affects your stack