mcp-pinot: Unauthenticated tool invocation via default oauth_enabled=False + host 0.0.0.0 bind

{
  "id": "fb5af156edeaf8d3c50369c2f5557a3dd0914a1a29de555ea0c68e0375338c17",
  "url": "https://osv.dev/vulnerability/CVE-2026-49257",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "mcp-pinot: Unauthenticated tool invocation via default oauth_enabled=False + host 0.0.0.0 bind",
    "summary": "mcp-pinot is a Python-based Model Context Protocol (MCP) server for interacting with Apache Pinot. In versions 3.0.1 and below, mcp-pinot defaults to running an HTTP MCP server bound to 0.0.0.0:8080 with no authentication enabled. All MCP tools, including SQL query execution, schema creation, and table-config mutation, are reachable by any network-adjacent caller. The server proxies these calls using server-side Pinot credentials, producing a confused-deputy condition that yields full read/write access to the configured Pinot cluster. This issue has been fixed in version 3.1.0",
    "evidence": "osv:CVE-2026-49257",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-49257",
      "aliases": [
        "CVE-2026-49257",
        "GHSA-73cv-556c-w3g6",
        "PYSEC-2026-410"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/startreedata/mcp-pinot",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1c7d3f9cd384854bf72c127d230bdb32299475ad"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.1.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "1c7d3f9cd384854bf72c127d230bdb32299475ad"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v3.0.1",
            "v3.0.0",
            "v2.3.0",
            "v2.2.0",
            "v2.1.0",
            "v2.0.0",
            "v1.1.0",
            "v1.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-49257.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:23.957314097Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49257.json",
        "https://github.com/startreedata/mcp-pinot/security/advisories/GHSA-73cv-556c-w3g6",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-49257",
        "https://github.com/startreedata/mcp-pinot/issues/90",
        "https://github.com/startreedata/mcp-pinot/commit/1c7d3f9cd384854bf72c127d230bdb32299475ad",
        "https://github.com/startreedata/mcp-pinot/pull/95"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-306"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49257.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-49257",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 490543,
  "published_at": "2026-06-18T21:01:10.984+00:00"
}