Resource exhaustion in Wazuh
CVE-2026-74039
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (44.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 44.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.006 · change: +0.003
Affected products
- Wazuh — versions 5.0.0
- Wazuh Wazuh-Manager — versions 5.0.0-beta2
Weakness classification (CWE)
References
- github.com/wazuh/wazuh/security/advisories/GHSA-5vh8-34r8-q74q (Exploit, vendor-advisory, Mitigation, Vendor Advisory)
- github.com/wazuh/wazuh/pull/37034 (Patch, patch, Issue Tracking)
- www.vulncheck.com/advisories/wazuh-api-dos-via-deeply-nested-json-auth-context (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-74039?
- CVE-2026-74039 is a medium-severity vulnerability in Wazuh, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 6.5/10. Published 2026-08-18.
- How severe is CVE-2026-74039?
- Medium severity. CVSS v3 base score is 6.5 out of 10.