SSRF in Ondata Ckan-Mcp-Server

CVE-2026-61612

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.

Vulnerability class: SSRF (Server-Side Request Forgery)

CVSS v3 metric

CVSS v3 base score 5.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-61612?
CVE-2026-61612 is a medium-severity vulnerability in Ondata Ckan-Mcp-Server, classified under Server-Side Request Forgery (SSRF). CVSS score: 5.7/10. Published 2026-09-21.
How severe is CVE-2026-61612?
Medium severity. CVSS v3 base score is 5.7 out of 10.