{"id":"EUVD-2026-64173","revision":"7bc3fcff58524424980549768c86e1ad","records":[{"revision":"7bc3fcff58524424980549768c86e1ad","observedAt":"2026-11-05T10:47:26.351+00:00","statement":{"source":"euvd","id":"EUVD-2026-64173","aliases":["CVE-2026-53509","GHSA-g84h-j7jj-x32p"],"title":"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 arbi…","description":"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 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`.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N","score":5.7,"severity":null}],"references":["https://github.com/ondata/ckan-mcp-server/security/advisories/GHSA-g84h-j7jj-x32p","https://github.com/advisories/GHSA-3xm7-qw7j-qc8v","https://github.com/ondata/ckan-mcp-server/releases/tag/v0.4.106"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-64173","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Aug 21, 2026, 9:21:20 PM","dateUpdated":"Aug 21, 2026, 9:42:22 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-64173","identifiers":["EUVD-2026-64173","CVE-2026-53509","GHSA-g84h-j7jj-x32p"]},"retained":false,"historicalAffected":[]}],"coverage":[]}