Resource exhaustion in Wazuh
CVE-2026-33754
Wazuh is a free and open source platform used for threat prevention, detection, and response. In versions 3.9.0 and above, prior to 4.14.5, a remote attacker can trigger memory exhaustion in the cluster protocol parser by sending a crafted message header with an arbitrarily large payload length. The length is trusted before authentication/decryption and used directly to allocate memory, allowing unauthenticated denial of service of the cluster service. This issue has been fixed in version 4.14.5.
Vulnerability class: DoS (Denial of Service)
EPSS: 0.004 (29.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Wazuh — versions >= 3.9.0, < 4.14.5
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-33754?
- CVE-2026-33754 is a medium-severity vulnerability in Wazuh, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2026-07-17.
- How severe is CVE-2026-33754?
- Medium severity. CVSS v3 base score is 6.5 out of 10.