Vulnerability Description
Wazuh is a free and open source platform used for threat prevention, detection, and response. From version 1.0.0 to before version 4.14.4, a heap-based out-of-bounds WRITE occurs in GetAlertData, resulting in writing a NULL byte exactly 1 byte before the start of the buffer allocated by strdup. Due to unsigned integer underflow and pointer arithmetic wrapping, the write lands at offset -1 from the buffer, corrupting heap metadata. A malicious actor can potentially leverage this issue through a compromised agent to cause denial of service or heap corruption by injecting a specially crafted alert into the alerts log file monitored by wazuh-logcollector. This issue has been patched in version 4.14.4.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Wazuh | Wazuh | >= 1.0.0, < 4.14.4 |
Related Weaknesses (CWE)
References
- https://github.com/wazuh/wazuh/releases/tag/v4.14.4Release Notes
- https://github.com/wazuh/wazuh/security/advisories/GHSA-j4c7-hwjw-8857ExploitVendor Advisory
- https://github.com/wazuh/wazuh/security/advisories/GHSA-j4c7-hwjw-8857ExploitVendor Advisory
FAQ
What is CVE-2026-26204?
CVE-2026-26204 is a vulnerability with a CVSS score of 4.4 (MEDIUM). Wazuh is a free and open source platform used for threat prevention, detection, and response. From version 1.0.0 to before version 4.14.4, a heap-based out-of-bounds WRITE occurs in GetAlertData, resu...
How severe is CVE-2026-26204?
CVE-2026-26204 has been rated MEDIUM with a CVSS base score of 4.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-26204?
Check the references section above for vendor advisories and patch information. Affected products include: Wazuh Wazuh.