{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "3.9.0"
              },
              {
                "fixed": "4.14.5"
              },
              {
                "introduced": "5.0.0-beta1"
              },
              {
                "fixed": "5.0.0-beta2"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "18bac2de69f5a37e5c3c4e2dfbce5a0093042ea7"
            },
            {
              "introduced": "cddd833300cb5af494ba7dab31192bae649eb184"
            },
            {
              "fixed": "460511d384aadc1d539caa6c4aa6a4234d68c9ba"
            },
            {
              "fixed": "b58b3b2552497639b1b2a2b23e8de87e4ce9cf02"
            },
            {
              "fixed": "d29c5c89a0e16477545ca27f4e06229021e3183c"
            }
          ],
          "repo": "https://github.com/wazuh/wazuh",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-h5r8-gvhv-cmp2"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-770",
      "CWE-789"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44253.json"
  },
  "details": "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 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.",
  "id": "CVE-2026-44253",
  "modified": "2026-09-11T03:30:57.821907838Z",
  "published": "2026-08-19T16:06:06.158Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/wazuh/wazuh/releases/tag/v4.14.5"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44253.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/wazuh/wazuh/security/advisories/GHSA-h5r8-gvhv-cmp2"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-44253"
    },
    {
      "type": "FIX",
      "url": "https://github.com/wazuh/wazuh/commit/d29c5c89a0e16477545ca27f4e06229021e3183c"
    },
    {
      "type": "FIX",
      "url": "https://github.com/wazuh/wazuh/pull/35173"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Wazuh: Cluster Protocol Memory Exhaustion (DoS) via unbounded receive_str allocation and div_msg_box accumulation"
}