Reference page — cumulative record through Saturday, October 3, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-74039

CVE-2026-74039HIGH

Wazuh 4.0.0 < 4.14.7 API DoS via Deeply Nested JSON auth_context

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   N   L   N   N   N   H    7.1   .0056   44.3     —

AFFECTED
  Product        Versions  Fixed
  wazuh-manager  4.0.0 –   —

TIMELINE
  Aug 14  Reserved by VulnCheck
  Aug 18  Published (CNA: VulnCheck)
  Sep 16  EXPLOIT PUBLISHED — CVE-2026-74039 (wazuh-manager). Public exploit reference added.
  Oct 1   EXPLOIT PUBLISHED — CVE-2026-74039 (wazuh-manager). Public exploit reference added.

CWE-770, CWE-1333 · CNA: VulnCheck · CVSS v4.0 · 3 references · NVD status: Analyzed

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.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
August 14, 2026	Reserved	Reserved by VulnCheck
August 18, 2026	Published	Published (CNA: VulnCheck)
September 16, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-74039 (wazuh-manager). Public exploit reference added.
October 1, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-74039 (wazuh-manager). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Wazuh	wazuh-manager	—	4.0.0	—

Weaknesses

CWE-770 · CWE-1333

References (3)

https://github.com/wazuh/wazuh/pull/37034 [Issue Tracking, Patch]
https://github.com/wazuh/wazuh/security/advisories/GHSA-5vh8-34r8-q74q [Exploit, Mitigation, Vendor Advisory]
https://www.vulncheck.com/advisories/wazuh-api-dos-via-deeply-nested-json-auth-context [Third Party Advisory]

Authoritative record: CVE-2026-74039 at cve.org

Vendors: wazuh

Weaknesses: CWE-770 · CWE-1333

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-74039 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Saturday, October 3, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.