What’s Vulnerable › Vulnerabilities

CVE-2026-74039: Wazuh 4.0.0 < 4.14.7 API DoS via Deeply Nested JSON auth_context

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-08-18 · updated 2026-10-22
• Weakness: CWE-770

Description

Wazuh 4.0.0 before 4.14.7 and 5.0.0-beta2 contain a denial of service vulnerability that allows authenticated attackers with allow_run_as enabled to exhaust CPU resources by submitting arbitrarily deeply nested JSON structures to the POST /security/user/authenticate/run_as endpoint. Attackers can repeatedly submit malformed auth_context bodies with unlimited nesting depth to cause the API framework to consume excessive CPU, denying service to all other API consumers.

Affected products

• wazuh: from 4.0.0 before 4.14.7; 5.0.0-beta1, 5.0.0-beta2 — fixed in 4.14.7

How to fix

Upgrade to a fixed version: wazuh 4.14.7. Check the vendor advisory for mitigations.

References

• https://github.com/wazuh/wazuh/pull/37034
• https://github.com/wazuh/wazuh/security/advisories/GHSA-5vh8-34r8-q74q
• https://www.vulncheck.com/advisories/wazuh-api-dos-via-deeply-nested-json-auth-context
• https://github.com/wazuh/wazuh/security/advisories/GHSA-5vh8-34r8-q74q

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