# CVE-2026-74039

## Summary

- **CVE ID:** CVE-2026-74039
- **Severity:** HIGH
- **CVSS Score:** 7.1 (CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-770, CWE-1333
- **Published:** Aug 18, 2026
- **Last Modified:** Aug 18, 2026

## 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 — wazuh-manager (4.0.0)
- Wazuh — wazuh-manager (5.0.0-beta2)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.36%
- **EPSS Percentile:** 29.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._