Wazuh is widely used for endpoint/manager security; this RCE lets a cluster worker compromise manager and all agents, risking enterprise-wide breach and operational disruption.
CVE-2026-74040
Wazuh cluster flaw lets a worker overwrite master files and achieve root RCE.
Is CVE-2026-74040 being exploited?
Not confirmed. CVE-2026-74040 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.55% probability of exploitation in the next 30 days.
How severe is CVE-2026-74040?
CVE-2026-74040 is rated Critical with a CVSS score of 9.4. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-74040?
Yes. A fix has been recorded for CVE-2026-74040. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-74040 affect?
CVE-2026-74040 affects Wazuh Manager and Agents, Wazuh versions >=3.9.0 and <4.14.8. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-74040?
Upgrade to Wazuh v4.14.8+, isolate/inspect workers, rotate credentials, verify integrity.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
A malicious or compromised cluster worker can overwrite ossec.conf and agent.conf, enabling root remote code execution on the manager and all agents.
Immediate action required
- affected>= 3.9.0 and < 4.14.8
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.