Vulnerability in Wazuh
CVE-2026-74046
Wazuh 4.4.0 before 4.14.7 contains a denial of service vulnerability in the fdecompress_files() function within cluster.py that allows authenticated cluster peers to exhaust memory by supplying a malicious synchronization archive without decompressed size limits. Attackers holding a valid cluster Fernet key can upload a small, highly compressed zip bomb archive that forces wazuh-clusterd on the master node to decompress the full payload into memory, causing memory exhaustion and service disruption.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (45.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 45.8% 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
Weakness classification (CWE)
References
- github.com/wazuh/wazuh/security/advisories/GHSA-mr7j-w2m4-vw5j (Exploit, vendor-advisory, Mitigation, Vendor Advisory)
- github.com/wazuh/wazuh/pull/37119 (Patch, patch, Issue Tracking)
- www.vulncheck.com/advisories/wazuh-dos-via-fdecompress-files-zip-bomb (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-74046?
- CVE-2026-74046 is a medium-severity vulnerability in Wazuh, classified under Improper Handling of Highly Compressed Data (Data Amplification). CVSS score: 4.9/10. Published 2026-08-18.
- How severe is CVE-2026-74046?
- Medium severity. CVSS v3 base score is 4.9 out of 10.