{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@aborruso/ckan-mcp-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.4.106"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-53509"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-07T19:35:57Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Summary\nA known vulnerability CVE-2026-33060 indicated tools including ckan_package_search and sparql_query that accept a base_url parameter had the risk of making HTTP requests to arbitrary endpoints without restriction. A fix was applied to filter out ip addresses. However, a method to bypass exists.\n\n### Details\nCKAN MCP Server validates caller-supplied CKAN server URLs by inspecting only the parsed hostname string before issuing outbound HTTP requests. In `src/utils/http.ts`, hostname aliases such as `ip6-localhost` are not equal to `localhost`, are not dotted IPv4 literals, and are not bracketed IPv6 literals, so they pass the SSRF filter but can resolve to loopback when the server performs the request. A remote MCP caller that can invoke CKAN tools with a `server_url` can therefore make the server connect to local or private addresses and, for CKAN-shaped responses, receive response-derived data.\n\n### Fix\nReplaced the single `hostname === \u0027localhost\u0027` check with a blocked-hostname `Set` covering `ip6-localhost` and `ip6-loopback`. Patched in commit `c761045a1b7c5f40d2626540dd2ef1d4feb91f8c`.\n\n---\n@aborruso/ckan-mcp-server thanks **hibrian827** for responsibly disclosing this issue.",
  "id": "GHSA-g84h-j7jj-x32p",
  "modified": "2026-07-07T19:35:57Z",
  "published": "2026-07-07T19:35:57Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/ondata/ckan-mcp-server/security/advisories/GHSA-g84h-j7jj-x32p"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-3xm7-qw7j-qc8v"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/ondata/ckan-mcp-server"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ondata/ckan-mcp-server/releases/tag/v0.4.106"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "@aborruso/ckan-mcp-server: SSRF via base_url allows access to internal networks (Potential fix bypass of CVE-2026-33060)"
}