Wazuh up to 4.14.4 wazuh-analysisd W_JSON_ParseRootcheck Value heap-based overflow

Summaryinfo

A vulnerability was found in Wazuh up to 4.14.4. It has been rated as critical. Affected by this vulnerability is the function W_JSON_ParseRootcheck of the component wazuh-analysisd. This manipulation of the argument Value causes heap-based overflow. This vulnerability is tracked as CVE-2026-34150. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability has been found in Wazuh up to 4.14.4 and classified as critical. Affected by this vulnerability is the function W_JSON_ParseRootcheck of the component wazuh-analysisd. The manipulation of the argument value with an unknown input leads to a heap-based overflow vulnerability. The CWE definition for the vulnerability is CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-34150 since 03/25/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 4.14.5 eliminates this vulnerability.

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Productinfo

Name

• Wazuh

Version

• 4.14.0
• 4.14.1
• 4.14.2
• 4.14.3
• 4.14.4

Website

• Product: https://github.com/wazuh/wazuh/

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