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.
History

Thu, 30 Apr 2026 20:45:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:wazuh:wazuh:*:*:*:*:*:*:*:*

Thu, 30 Apr 2026 13:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 29 Apr 2026 20:15:00 +0000

Type Values Removed Values Added
First Time appeared Wazuh
Wazuh wazuh
Vendors & Products Wazuh
Wazuh wazuh

Wed, 29 Apr 2026 18:00:00 +0000

Type Values Removed Values Added
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.
Title Wazuh: Heap-based NULL WRITE Buffer Underflow in GetAlertData
Weaknesses CWE-124
CWE-191
References
Metrics cvssV3_1

{'score': 4.4, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-04-29T17:43:44.911Z

Updated: 2026-04-30T12:48:18.639Z

Reserved: 2026-02-11T19:56:24.814Z

Link: CVE-2026-26204

cve-icon Vulnrichment

Updated: 2026-04-30T12:47:46.312Z

cve-icon NVD

Status : Analyzed

Published: 2026-04-29T18:16:04.820

Modified: 2026-04-30T20:40:53.320

Link: CVE-2026-26204

cve-icon Redhat

No data.