CVE-2026-61612

Description

CKAN MCP Server is a tool for querying CKAN open data portals. Prior to version 0.4.108, the SSRF guard `validateServerUrl` (added for CVE-2026-33060, extended for CVE-2026-53509) validates only the hostname string and never resolves DNS. Any caller-supplied `server_url` whose hostname *resolves* to an internal address passes the guard, so the server issues requests to loopback and cloud metadata (`169.254.169.254`). This is a third bypass of the same guard, and it reaches IMDS — strictly more than CVE-2026-53509, which only reached loopback. Version 0.4.108 contains an updated fix.

References

• https://github.com/advisories/GHSA-3xm7-qw7j-qc8v
• https://github.com/advisories/GHSA-g84h-j7jj-x32p
• https://github.com/ondata/ckan-mcp-server/commit/bb7439b553b9f965adc3d43bcd415c42eebe2f40
• https://github.com/ondata/ckan-mcp-server/releases/tag/v0.4.108
• https://github.com/ondata/ckan-mcp-server/security/advisories/GHSA-798p-78g2-v556