What’s Vulnerable › Vulnerabilities

CVE-2026-74046: Wazuh 4.4.0 < 4.14.7 DoS via fdecompress_files() Zip Bomb

• Severity: medium (CVSS 4.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-08-18 · updated 2026-10-22
• Weakness: CWE-409

Description

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.

Affected products

• wazuh: from 4.4.0 before 4.14.7 — fixed in 4.14.7

How to fix

Upgrade to a fixed version: wazuh 4.14.7. Check the vendor advisory for mitigations.

References

• https://github.com/wazuh/wazuh/pull/37119
• https://github.com/wazuh/wazuh/security/advisories/GHSA-mr7j-w2m4-vw5j
• https://www.vulncheck.com/advisories/wazuh-dos-via-fdecompress-files-zip-bomb
• https://github.com/wazuh/wazuh/security/advisories/GHSA-mr7j-w2m4-vw5j

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