{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-26204","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-02-11T19:56:24.814Z","datePublished":"2026-04-29T17:43:44.911Z","dateUpdated":"2026-04-30T12:48:18.639Z"},"containers":{"cna":{"title":"Wazuh: Heap-based NULL WRITE Buffer Underflow in GetAlertData","problemTypes":[{"descriptions":[{"cweId":"CWE-124","lang":"en","description":"CWE-124: Buffer Underwrite ('Buffer Underflow')","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-191","lang":"en","description":"CWE-191: Integer Underflow (Wrap or Wraparound)","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":4.4,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"HIGH","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"references":[{"name":"https://github.com/wazuh/wazuh/security/advisories/GHSA-j4c7-hwjw-8857","tags":["x_refsource_CONFIRM"],"url":"https://github.com/wazuh/wazuh/security/advisories/GHSA-j4c7-hwjw-8857"},{"name":"https://github.com/wazuh/wazuh/releases/tag/v4.14.4","tags":["x_refsource_MISC"],"url":"https://github.com/wazuh/wazuh/releases/tag/v4.14.4"}],"affected":[{"vendor":"wazuh","product":"wazuh","versions":[{"version":">= 1.0.0, < 4.14.4","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-04-29T17:43:44.911Z"},"descriptions":[{"lang":"en","value":"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."}],"source":{"advisory":"GHSA-j4c7-hwjw-8857","discovery":"UNKNOWN"}},"adp":[{"references":[{"url":"https://github.com/wazuh/wazuh/security/advisories/GHSA-j4c7-hwjw-8857","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-30T12:48:02.731556Z","id":"CVE-2026-26204","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-04-30T12:48:18.639Z"}}]}}