Wazuh: Heap-based NULL WRITE Buffer Underflow in GetAlertData_CVE-2026-26204

{
    "lastseen": "",
    "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.",
    "published": "2026-04-29T17:43:44.911Z",
    "modified": "2026-04-29T17:43:44.911Z",
    "type": "cve",
    "title": "Wazuh: Heap-based NULL WRITE Buffer Underflow in GetAlertData",
    "source": "GitHub_M",
    "references": "https://github.com/wazuh/wazuh/security/advisories/GHSA-j4c7-hwjw-8857\nhttps://github.com/wazuh/wazuh/releases/tag/v4.14.4",
    "id": "CVE-2026-26204",
    "bulletinFamily": "",
    "cwe": [
        "CWE-124",
        "CWE-191"
    ],
    "cvelist": null,
    "sourceData": "wazuh wazuh >= 1.0.0, < 4.14.4",
    "sourceHref": "",
    "cvss": {
        "score": 4.4,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "wazuh",
    "version": ">= 1.0.0, < 4.14.4",
    "vendor": "wazuh",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}