ZDI-26-528: Wazuh Cluster DAPI Protocol Deserialization of Untrusted Data Remote Code Execution Vulnerability
This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Wazuh. An attacker must first obtain the ability to execute low-privileged code on a worker node in order to exploit this vulnerability. The ZDI has assigned a CVSS rating of 9.9. The following CVEs are assigned: CVE-2026-28220.
AI Analysis
Technical Summary
CVE-2026-28220 is a critical vulnerability in Wazuh affecting the as_wazuh_object deserializer within the Cluster DAPI protocol. The flaw arises from improper validation of user-supplied data, enabling deserialization of untrusted input. An attacker with low-privileged code execution on a worker node can exploit this to execute arbitrary code as root on the master node. The vulnerability has a CVSS score of 9.9, indicating high impact on confidentiality, integrity, and availability. Wazuh has issued a security update to fix this vulnerability.
Potential Impact
An attacker who has already gained low-privileged code execution on a worker node can escalate privileges and execute arbitrary code with root permissions on the master node. This compromises the entire Wazuh cluster, potentially leading to full system compromise, data breach, and disruption of security monitoring capabilities.
Mitigation Recommendations
Wazuh has released an official update that addresses this vulnerability. Users should apply the provided security update promptly to remediate the issue. No alternative mitigations are indicated by the vendor advisory.
ZDI-26-528: Wazuh Cluster DAPI Protocol Deserialization of Untrusted Data Remote Code Execution Vulnerability
Description
This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Wazuh. An attacker must first obtain the ability to execute low-privileged code on a worker node in order to exploit this vulnerability. The ZDI has assigned a CVSS rating of 9.9. The following CVEs are assigned: CVE-2026-28220.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-28220 is a critical vulnerability in Wazuh affecting the as_wazuh_object deserializer within the Cluster DAPI protocol. The flaw arises from improper validation of user-supplied data, enabling deserialization of untrusted input. An attacker with low-privileged code execution on a worker node can exploit this to execute arbitrary code as root on the master node. The vulnerability has a CVSS score of 9.9, indicating high impact on confidentiality, integrity, and availability. Wazuh has issued a security update to fix this vulnerability.
Potential Impact
An attacker who has already gained low-privileged code execution on a worker node can escalate privileges and execute arbitrary code with root permissions on the master node. This compromises the entire Wazuh cluster, potentially leading to full system compromise, data breach, and disruption of security monitoring capabilities.
Mitigation Recommendations
Wazuh has released an official update that addresses this vulnerability. Users should apply the provided security update promptly to remediate the issue. No alternative mitigations are indicated by the vendor advisory.
Technical Details
- Classification
- {"confidence":0.95,"severitySource":"cvss-text","classifier":"rss-v2"}
- Article Source
- {"url":"http://www.zerodayinitiative.com/advisories/ZDI-26-528/","fetched":true,"fetchedAt":"2026-08-12T20:04:32.673Z","wordCount":205}
Threat ID: 6a7cd31fbf8831d539148b52
Added to database: 08/12/2026, 20:10:07 UTC
Last enriched: 08/12/2026, 20:13:43 UTC
Last updated: 08/13/2026, 01:33:36 UTC
Views: 5
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