What’s Vulnerable › Vulnerabilities

CVE-2026-74040: Wazuh 3.9.0 before 4.14.8 Arbitrary File Overwrite RCE via process_files_from_worker

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-13 · updated 2026-10-16
• Weakness: CWE-862

Description

Wazuh versions from 3.9.0 before 4.14.8 contain an arbitrary file overwrite vulnerability in MasterHandler.process_files_from_worker allowing a cluster worker to overwrite protected master files. Attackers controlling a worker can use a trailing-slash basename bypass and missing extra_valid enforcement to overwrite ossec.conf and agent.conf, achieving root remote code execution across the manager and every agent.

Affected products

• wazuh: from 3.9.0 before 4.14.8 — fixed in 4.14.8

How to fix

Upgrade to a fixed version: wazuh 4.14.8. Check the vendor advisory for mitigations.

References

• https://github.com/wazuh/wazuh/releases/tag/v4.14.8
• https://github.com/wazuh/wazuh/security/advisories/GHSA-88p6-7cm8-xwj8
• https://www.vulncheck.com/advisories/wazuh-3.9.0-before-4.14.8-arbitrary-file-overwrite-rce-via-process-files-from-worker
• https://github.com/wazuh/wazuh/security/advisories/GHSA-88p6-7cm8-xwj8

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