CVE-2026-61612: @aborruso/ckan-mcp-server has SSRF via DNS-name → internal IP — incomplete fix of CVE-2026-53509
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, still present in the current latest 0.4.107, and it reaches IMDS — strictly more than CVE-2026-53509, which only reached loopback.
References
- github.com/advisories/GHSA-3xm7-qw7j-qc8v
- github.com/advisories/GHSA-798p-78g2-v556
- github.com/advisories/GHSA-g84h-j7jj-x32p
- github.com/ondata/ckan-mcp-server/commit/bb7439b553b9f965adc3d43bcd415c42eebe2f40
- github.com/ondata/ckan-mcp-server/releases/tag/v0.4.108
- github.com/ondata/ckan-mcp-server/security/advisories/GHSA-798p-78g2-v556
- nvd.nist.gov/vuln/detail/CVE-2026-61612
Code Behaviors & Features
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