Wazuh up to 4.14.2 API middlewares.py generate_keypair resource consumption

Summaryinfo

A vulnerability has been found in Wazuh up to 4.14.2 and classified as problematic. This affects the function generate_keypair of the file middlewares.py of the component API. This manipulation causes resource consumption. This vulnerability appears as CVE-2026-25771. The attack may be initiated remotely. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Wazuh up to 4.14.2. It has been declared as problematic. Affected by this vulnerability is the function generate_keypair of the file middlewares.py of the component API. The manipulation with an unknown input leads to a resource consumption vulnerability. The CWE definition for the vulnerability is CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. As an impact it is known to affect availability. The summary by CVE is:

Wazuh is a free and open source platform used for threat prevention, detection, and response. Starting in version 4.3.0 and prior to version 4.14.3, a Denial of Service (DoS) vulnerability exists in the Wazuh API authentication middleware (`middlewares.py`). The application uses an asynchronous event loop (Starlette/Asyncio) to call a synchronous function (`generate_keypair`) that performs blocking disk I/O on every request containing a Bearer token. An unauthenticated remote attacker can exploit this by flooding the API with requests containing invalid Bearer tokens. This forces the single-threaded event loop to pause for file read operations repeatedly, starving the application of CPU resources and potentially preventing it from accepting or processing legitimate connections. Version 4.14.3 fixes the issue.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-25771 since 02/05/2026. 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. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

Upgrading to version 4.14.3 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-0771). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

• Open Source Wazuh

Productinfo

Name

• Wazuh

Version

• 4.14.0
• 4.14.1
• 4.14.2

Website

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

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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