CVE-2026-74046: Improper Handling of Highly Compressed Data (Data Amplification) in Wazuh wazuh-manager
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.
AI Analysis
Technical Summary
CVE-2026-74046 is a denial of service vulnerability in Wazuh wazuh-manager affecting versions 4.4.0 through before 4.14.7. The flaw exists in the fdecompress_files() function within cluster.py, where authenticated cluster peers can supply a malicious synchronization archive that lacks decompressed size limits. This allows an attacker holding a valid cluster Fernet key to upload a small but highly compressed zip bomb archive, causing the wazuh-clusterd process on the master node to decompress the entire payload into memory, leading to memory exhaustion and service disruption.
Potential Impact
An attacker with valid cluster authentication can cause memory exhaustion on the master node, resulting in denial of service and disruption of Wazuh cluster operations. This impacts availability but does not indicate confidentiality or integrity compromise.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict cluster peer access to trusted entities and monitor for unusual synchronization archive sizes or decompression activity.
CVE-2026-74046: Improper Handling of Highly Compressed Data (Data Amplification) in Wazuh wazuh-manager
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.
CVSS v4.0
Score 6.9medium
Affected software
pkg:github/wazuh-managerRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-74046 is a denial of service vulnerability in Wazuh wazuh-manager affecting versions 4.4.0 through before 4.14.7. The flaw exists in the fdecompress_files() function within cluster.py, where authenticated cluster peers can supply a malicious synchronization archive that lacks decompressed size limits. This allows an attacker holding a valid cluster Fernet key to upload a small but highly compressed zip bomb archive, causing the wazuh-clusterd process on the master node to decompress the entire payload into memory, leading to memory exhaustion and service disruption.
Potential Impact
An attacker with valid cluster authentication can cause memory exhaustion on the master node, resulting in denial of service and disruption of Wazuh cluster operations. This impacts availability but does not indicate confidentiality or integrity compromise.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict cluster peer access to trusted entities and monitor for unusual synchronization archive sizes or decompression activity.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-08-14T14:06:40.513Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a849b61c6e8be03328d7587
Added to database: 08/18/2026, 17:50:25 UTC
Last enriched: 08/18/2026, 18:05:26 UTC
Last updated: 09/09/2026, 22:52:14 UTC
Views: 51
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