---
id: CVE-2026-53509
title: CKAN MCP Server is a tool for querying CKAN open data portals
summary: >-
  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 a…
severity: medium
cvss: 5.7
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N'
cwe:
  - CWE-918
vendor: aborruso
product: '@aborruso/ckan-mcp-server'
affected:
  - '@aborruso/ckan-mcp-server < 0.4.106'
patched:
  - '@aborruso/ckan-mcp-server 0.4.106'
published: '2026-08-21'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T21:06:39.057'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-53509'
references:
  - url: 'https://github.com/advisories/GHSA-3xm7-qw7j-qc8v'
    label: security-advisories@github.com
  - url: 'https://github.com/ondata/ckan-mcp-server/releases/tag/v0.4.106'
    label: security-advisories@github.com
  - url: >-
      https://github.com/ondata/ckan-mcp-server/security/advisories/GHSA-g84h-j7jj-x32p
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-g84h-j7jj-x32p'
tags:
  - nvd
  - ghsa
  - npm
epss: 0.00384
epssPercentile: 0.29587
aliases:
  - GHSA-g84h-j7jj-x32p
ecosystem: npm
ingestedAt: '2026-07-07T19:42:41.462Z'
---

## Overview

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`.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-53509)

Affected packages:

- `@aborruso/ckan-mcp-server < 0.4.106`

Patched in:

- `@aborruso/ckan-mcp-server 0.4.106`

Source: https://github.com/advisories/GHSA-g84h-j7jj-x32p