{"id":"CVE-2026-44253","title":"Wazuh is a free and open source platform used for threat prevention, detection, and response","summary":"Wazuh is a free and open source platform used for threat prevention, detection, and response. From 3.9.0 until 4.14.5 and 5.0.0-beta2, the Wazuh cluster protocol in framework/wazuh/core/cluster/common.py allows an authenticated cluster n…","severity":"medium","cvss":4.9,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-770","CWE-789"],"vendor":"wazuh","product":"wazuh","affected":["wazuh >= 3.9.0, < 4.14.5","wazuh = 5.0.0"],"patched":["wazuh 4.14.5"],"published":"2026-08-19","updated":"2026-09-22","sourceUpdated":"2026-09-22T19:47:36.957","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-44253","references":[{"url":"https://github.com/wazuh/wazuh/commit/d29c5c89a0e16477545ca27f4e06229021e3183c","label":"security-advisories@github.com"},{"url":"https://github.com/wazuh/wazuh/pull/35173","label":"security-advisories@github.com"},{"url":"https://github.com/wazuh/wazuh/releases/tag/v4.14.5","label":"security-advisories@github.com"},{"url":"https://github.com/wazuh/wazuh/security/advisories/GHSA-h5r8-gvhv-cmp2","label":"security-advisories@github.com"},{"url":"https://github.com/wazuh/wazuh/security/advisories/GHSA-h5r8-gvhv-cmp2","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"epss":0.00506,"epssPercentile":0.42221,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-08-25T02:13:22.111115Z"},"ingestedAt":"2026-09-10T19:30:24.044Z","slug":"CVE-2026-44253","body":"## Overview\n\nWazuh is a free and open source platform used for threat prevention, detection, and response. From 3.9.0 until 4.14.5 and 5.0.0-beta2, the Wazuh cluster protocol in framework/wazuh/core/cluster/common.py allows an authenticated cluster node to exhaust memory on the master. The receive_str() method accepts an attacker-controlled total for InBuffer without a maximum, so a new_str command can request a multi-gigabyte bytearray and repeated requests accumulate in in_str. The divided-message path also retains flag_divided fragments under unique counters in div_msg_box without a count, aggregate-size, or expiration limit. Exploitation can disrupt agent connectivity and alert processing across the monitored environment. This issue is fixed in versions 4.14.5 and 5.0.0-beta2.\n\n## Affected\n\n- `wazuh >= 3.9.0, < 4.14.5`\n- `wazuh = 5.0.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `wazuh 4.14.5`","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":27,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[]}