Stack-based Buffer Overflow Affecting wazuh/wazuh package, versions [4.8.0,4.14.4)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-WAZUHWAZUH-16415491
- published4 May 2026
- disclosed29 Apr 2026
- creditalimezar
Introduced: 29 Apr 2026
NewCVE-2026-28221 (opens in a new tab)How to fix?
Upgrade wazuh/wazuh to version 4.14.4 or higher.
Overview
Affected versions of this package are vulnerable to Stack-based Buffer Overflow via the print_hex_string function in wazuh-remoted when attacker-controlled bytes are formatted using sprintf on platforms where char is treated as signed, leading to sign-extension and out-of-bounds writes past a fixed stack buffer. An attacker can cause remote code execution or denial of service by sending specially crafted oversized messages prior to authentication over TCP/1514, which triggers the vulnerable diagnostic path. Additionally, remote log amplification is possible by sending unauthenticated oversized messages, resulting in attacker-controlled hex dumps being written to log files, degrading monitoring fidelity and consuming disk/I/O.