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CVE-2026-71540

7.5 · HIGH

Wazuh is an open-source security platform providing unified XDR and SIEM protection for endpoints and cloud workloads.

Published Sep 24, 2026CWE-770EPSS 0.43%

Overview

CVE-2026-71540 is a high-severity vulnerability. It was published on September 24, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Wazuh is an open-source security platform providing unified XDR and SIEM protection for endpoints and cloud workloads. From 3.9.0 until 4.14.7, wazuh-clusterd in framework/wazuh/core/cluster/common.py allocates a payload buffer using the size declared in a 20-byte cluster protocol header before Fernet decryption validates the peer. An unauthenticated network peer can declare a payload of up to 256 MiB, stop sending after the header, and retain that allocation until the TCP connection closes. The cluster listener has no application-level per-source connection budget in affected versions, allowing concurrent sockets to multiply memory consumption and potentially terminate the cluster process, disrupt synchronization, and interrupt distributed API forwarding. This issue is fixed in version 4.14.7.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/wazuh/wazuh/commit/9a996bc23d28725f6c1f8f7808355d90e20d3382GitHubgithub.com/wazuh/wazuh/pull/37280GitHubgithub.com/wazuh/wazuh/releases/tag/v4.14.7GitHubgithub.com/wazuh/wazuh/security/advisories/GHSA-78wx-4r6w-w73fGitHubgithub.com/wazuh/wazuh/security/advisories/GHSA-78wx-4r6w-w73f

How CyberStrike helps

Frequently asked questions

What is CVE-2026-71540?

CVE-2026-71540 is a high-severity vulnerability. It was published on September 24, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-71540?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-71540?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-71540?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-71540 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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