Medium severity · published Aug 18, 2026
CVE-2026-74039
Wazuh 4.0.0 < 4.14.7 API DoS via Deeply Nested JSON auth_context
6.5
CVSS
0.6%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 46% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WA
wazuh-manager · Wazuh
4.0.0 before 4.14.7; 5.0.0-beta2 · source: vendor
WA
Wazuh · Wazuh
4.0.0 before 4.14.7; 5.0.0; 5.0.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-74039
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-74039
vendor-advisory
https://github.com/wazuh/wazuh/security/advisories/GHSA-5vh8-34r8-q74q
patch
https://github.com/wazuh/wazuh/pull/37034
third-party-advisory
https://www.vulncheck.com/advisories/wazuh-api-dos-via-deeply-nested-json-auth-context
More from wazuh-manager
9.1
CVE-2026-74040
Wazuh 3.9.0 before 4.14.8 Arbitrary File Overwrite RCE via process_files_from_worker
9.0
CVE-2026-74043
Wazuh 4.1.1 before 4.14.8 Path Traversal via Cluster Upload Functions
7.5
CVE-2026-74034
Wazuh 4.1.0 before 4.14.8 Arbitrary File Read via upgrade_custom Command
7.5
CVE-2025-15615
Wazuh Manager authd service Improper SSL/TLS Renegotiation Handling leading to Denial of Service
7.5
CVE-2026-32983
SSL/TLS Renegotiation DoS in Wazuh Manager authd service