# CVE-2026-26204

## Summary

- **CVE ID:** CVE-2026-26204
- **Severity:** MEDIUM
- **CVSS Score:** 4.4 (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-124, CWE-191
- **Published:** Apr 29, 2026
- **Last Modified:** Apr 30, 2026

## 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.

## Affected Products

- wazuh — wazuh (>= 1.0.0, < 4.14.4)

## References

- [CNA](https://github.com/wazuh/wazuh/security/advisories/GHSA-j4c7-hwjw-8857)
- [CNA](https://github.com/wazuh/wazuh/releases/tag/v4.14.4)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.17%
- **EPSS Percentile:** 6.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._