Wazuh: Unauthenticated cluster packet length leads to uncontrolled memory allocation (remote DoS)

{
  "id": "4c360d3b46c7d2006765bd12ff3d7dc7f14b1d6cf3f9c4ca753a60915c8c1164",
  "url": "https://osv.dev/vulnerability/CVE-2026-33754",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Wazuh: Unauthenticated cluster packet length leads to uncontrolled memory allocation (remote DoS)",
    "summary": "Wazuh is a free and open source platform used for threat prevention, detection, and response. In versions 3.9.0 and above, prior to 4.14.5, a remote attacker can trigger memory exhaustion in the cluster protocol parser by sending a crafted message header with an arbitrarily large payload length. The length is trusted before authentication/decryption and used directly to allocate memory, allowing unauthenticated denial of service of the cluster service. This issue has been fixed in version 4.14.5.",
    "evidence": "osv:CVE-2026-33754",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-33754",
      "aliases": [
        "CVE-2026-33754",
        "GHSA-476v-28pp-5wg9"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/wazuh/wazuh",
              "type": "GIT",
              "events": [
                {
                  "introduced": "18bac2de69f5a37e5c3c4e2dfbce5a0093042ea7"
                },
                {
                  "fixed": "460511d384aadc1d539caa6c4aa6a4234d68c9ba"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "3.9.0"
                      },
                      {
                        "fixed": "4.14.5"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "cpe": "cpe:2.3:a:wazuh:wazuh:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "3.9.0"
                      },
                      {
                        "fixed": "4.14.5"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33754.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.610475168Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33754.json",
        "https://github.com/wazuh/wazuh/security/advisories/GHSA-476v-28pp-5wg9",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-33754"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-400"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33754.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-33754",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 499454,
  "published_at": "2026-07-16T23:40:59.817+00:00"
}