MLflow: Unauthenticated full-read SSRF in webhook delivery: _validate_webhook_url bypassed via unvalidated HTTP redirects (and DNS rebinding)

{
  "id": "54662259bc639f3b0485e7d9aebfff296d1b4324a82ea73bd9a09f9a4648c8e2",
  "url": "https://osv.dev/vulnerability/BIT-mlflow-2026-64849",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "MLflow: Unauthenticated full-read SSRF in webhook delivery: _validate_webhook_url bypassed via unvalidated HTTP redirects (and DNS rebinding)",
    "summary": "MLflow is an open source AI engineering platform for agents, large language models, and machine learning models. Starting in 3.3.0 and prior to 3.15.0, the unauthenticated POST /api/2.0/mlflow/webhooks/{id}/test endpoint calls _validate_webhook_url() in mlflow/utils/validation.py only for the original URL while mlflow/webhooks/delivery.py follows redirects and re-resolves the hostname without pinning the validated address, allowing attackers to reach internal or cloud metadata services and receive response_status and response_body. This issue is fixed in version 3.15.0.",
    "evidence": "osv:BIT-mlflow-2026-64849",
    "products": [
      {
        "name": {
          "value": "mlflow",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "3.15.0",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "critical",
    "structured": {
      "id": "BIT-mlflow-2026-64849",
      "aliases": [
        "BIT-mlflow-2026-64849",
        "CVE-2026-64849",
        "GHSA-7gwp-5pfp-969j",
        "PYSEC-2026-3687"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "3.3.0"
                },
                {
                  "fixed": "3.15.0"
                }
              ]
            }
          ],
          "package": {
            "name": "mlflow",
            "purl": "pkg:bitnami/mlflow",
            "ecosystem": "Bitnami"
          },
          "severity": [
            {
              "type": "CVSS_V3",
              "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N"
            }
          ],
          "database_specific": {
            "source": "https://github.com/bitnami/vulndb/tree/main/data/mlflow/BIT-mlflow-2026-64849.json"
          }
        }
      ],
      "modified": "2026-10-06T15:15:04.141802740Z",
      "provider": "osv",
      "references": [
        "https://github.com/mlflow/mlflow/commit/ba949522477cbd5915aa55d29b0cfad7d5ddf939",
        "https://github.com/mlflow/mlflow/issues/24179",
        "https://github.com/mlflow/mlflow/pull/24258",
        "https://github.com/mlflow/mlflow/releases/tag/v3.15.0",
        "https://github.com/mlflow/mlflow/security/advisories/GHSA-7gwp-5pfp-969j",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-64849",
        "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-64849"
      ],
      "provider_metadata": {
        "cpes": [
          "cpe:2.3:a:lfprojects:mlflow:*:*:*:*:*:*:*:*"
        ],
        "severity": "Critical"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-64849",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 89110,
  "published_at": "2026-08-21T05:51:48.507+00:00"
}