{"id":"CVE-2026-53509","title":"CKAN MCP Server is a tool for querying CKAN open data portals","summary":"CKAN MCP Server is a tool for querying CKAN open data portals. A 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 a…","severity":"medium","cvss":5.7,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N","cwe":["CWE-918"],"vendor":"aborruso","product":"@aborruso/ckan-mcp-server","affected":["@aborruso/ckan-mcp-server < 0.4.106"],"patched":["@aborruso/ckan-mcp-server 0.4.106"],"published":"2026-08-21","updated":"2026-09-09","sourceUpdated":"2026-09-09T21:06:39.057","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-53509","references":[{"url":"https://github.com/advisories/GHSA-3xm7-qw7j-qc8v","label":"security-advisories@github.com"},{"url":"https://github.com/ondata/ckan-mcp-server/releases/tag/v0.4.106","label":"security-advisories@github.com"},{"url":"https://github.com/ondata/ckan-mcp-server/security/advisories/GHSA-g84h-j7jj-x32p","label":"security-advisories@github.com"},{"url":"https://github.com/advisories/GHSA-g84h-j7jj-x32p"}],"tags":["nvd","ghsa","npm"],"epss":0.00217,"epssPercentile":0.12343,"aliases":["GHSA-g84h-j7jj-x32p"],"ecosystem":"npm","ingestedAt":"2026-07-07T19:42:41.462Z","slug":"CVE-2026-53509","body":"## Overview\n\nCKAN MCP Server is a tool for querying CKAN open data portals. A 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 prior to version 0.4.106. CKAN 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. The updated fix in version 0.4.106 replaced the single `hostname === 'localhost'` check with a blocked-hostname `Set` covering `ip6-localhost` and `ip6-loopback`.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-53509)\n\nAffected packages:\n\n- `@aborruso/ckan-mcp-server < 0.4.106`\n\nPatched in:\n\n- `@aborruso/ckan-mcp-server 0.4.106`\n\nSource: https://github.com/advisories/GHSA-g84h-j7jj-x32p","depth":"sunlit","depthScore":31,"depthScoreParts":{"impact":31.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}