MLflow: Arbitrary file read on unauthenticated MLflow servers via prompt model version source

{
  "id": "00202f2433c76e7e33263d4c6af1704d9349027acf8dd67eb7ca6dd3032c4e2b",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-116690",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "MLflow: Arbitrary file read on unauthenticated MLflow servers via prompt model version source",
    "summary": "MLflow is an open source AI engineering platform for agents, large language models, and machine learning models. From 3.10.0 until 3.17.0, the prompt branch in _create_model_version() accepts schemeless relative sources because path validation runs only when a source has a URL scheme, and mlflow.prompt.is_prompt is interpreted by tag presence rather than a true value. A remote caller can store a server-local path as the model version artifact location and use /api/2.0/mlflow/model-versions/get-artifact to read files accessible to the MLflow server process. Default unauthenticated servers require no privileges, while basic-auth deployments are exposed to authenticated users who can create registered models. This issue is fixed in version 3.17.0.",
    "evidence": "cve:CVE-2026-116690",
    "products": [
      {
        "name": {
          "value": "mlflow",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-116690",
      "aliases": [
        "CVE-2026-116690"
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "scope": "UNCHANGED",
            "version": "3.1",
            "baseScore": 7.5,
            "attackVector": "NETWORK",
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
            "integrityImpact": "NONE",
            "userInteraction": "NONE",
            "attackComplexity": "LOW",
            "availabilityImpact": "NONE",
            "privilegesRequired": "NONE",
            "confidentialityImpact": "HIGH"
          }
        }
      ],
      "affected": [
        {
          "vendor": "mlflow",
          "product": "mlflow",
          "versions": [
            {
              "status": "affected",
              "version": ">= 3.10.0, < 3.17.0"
            }
          ]
        }
      ],
      "modified": "2026-10-28T16:13:38.096Z",
      "provider": "cve",
      "references": [
        "https://github.com/mlflow/mlflow/security/advisories/GHSA-m65p-9j7q-6w33",
        "https://github.com/mlflow/mlflow/pull/25870",
        "https://github.com/mlflow/mlflow/commit/81730a2ce4ebcd60d5d18f68c96f422ad7e30772",
        "https://github.com/mlflow/mlflow/releases/tag/v3.17.0"
      ],
      "provider_metadata": {
        "adp": [
          {
            "title": "CISA ADP Vulnrichment",
            "metrics": [
              {
                "other": {
                  "type": "ssvc",
                  "content": {
                    "id": "CVE-2026-116690",
                    "role": "CISA Coordinator",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "version": "2.0.3",
                    "timestamp": "2026-10-28T15:54:25.087287Z"
                  }
                }
              }
            ],
            "providerMetadata": {
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP",
              "dateUpdated": "2026-10-28T16:13:38.096Z"
            }
          }
        ],
        "cna": {
          "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
          "shortName": "GitHub_M",
          "dateUpdated": "2026-10-27T19:42:35.798Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-116690",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/containers/cna/metrics"
  },
  "source_id": "core-cve",
  "document_id": 460241,
  "published_at": "2026-10-27T19:42:35.798+00:00"
}