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EUVD-2026-277061

fkie_cve-2026-33060

CKAN MCP Server is a tool for querying CKAN open data portals. Versions prior to 0.4.85 provide tools including ckan_package_search and sparql_query that accept a base_url parameter, making HTTP requests to arbitrary endpoints without restriction. A CKAN portal client has no legitimate reason to contact cloud metadata or internal network services. There is no URL validation on base_url parameter. No private IP blocking (RFC 1918, link-local 169.254.x.x), no cloud metadata blocking. The sparql_query and ckan_datastore_search_sql tools also accept arbitrary base URLs and expose injection surfaces. An attack can lead to internal network scanning, cloud metadata theft (IAM credentials via IMDS at 169.254.169.254), potential SQL/SPARQL injection via unsanitized query parameters. Attack requires prompt injection to control the base_url parameter. This issue has been fixed in version 0.4.85.

GHSA-3xm7-qw7j-qc8v — SSRF in @aborruso/ckan-mcp-server via base_url allows access to internal networks

Affected: npm: @aborruso/ckan-mcp-server

## Summary

The `@aborruso/ckan-mcp-server` MCP server provides tools including `ckan_package_search` and `sparql_query` that accept a `base_url` parameter, making HTTP requests to arbitrary endpoints without restriction. A CKAN portal client has no legitimate reason to contact cloud metadata or internal network services.

## Severity

Attack complexity is HIGH because exploitation requires prompt injection via malicious content (webpage, document) while the victim's AI assistant has this MCP server connected.

## Proof of Concept

Tested inside Docker-in-Docker isolated environment with canary HTTP sidecar.

```json {"tool": "ckan_package_search", "arguments": {"base_url": "http://canary:8080/ssrf", "query": "test"}} ``` **Result**: Canary received **9 HTTP requests**. The high request volume confirms no rate limiting or URL validation.

## Root Cause

No URL validation on `base_url` parameter. No private IP blocking (RFC 1918, link-local 169.254.x.x), no cloud metadata blocking. The `sparql_query` and `ckan_datastore_search_sql` tools also accept arbitrary base URLs and expose injection surfaces.

## Impact

Internal network scanning, cloud metadata theft (IAM credentials via IMDS at 169.254.169.254), potential SQL/SPARQL injection via unsanitized query parameters. Attack requires prompt injection to control the `base_url` parameter.

## Recommended Fix

1. Validate `base_url` against a configurable allowlist of permitted CKAN portals 2. Block private IP ranges (RFC 1918,…