CVE-2026-33060

CKAN MCP Server: SSRF via base_url allows access to internal networks

CVSS 3.1 5.3 MEDIUMEUVD CVSS 3.1 5.3 CVSS 3.1 · [email protected] · Secondary 5.3 MEDIUMCVSS 3.1 · [email protected] · Primary 5.7 MEDIUMCVSS_V3 Publisher rating MODERATEFixed by @aborruso/ckan-mcp-server 0.4.85KEV status unknown

Original advisory

cve-program · CVE-2026-33060

Published

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.

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euvd · EUVD-2026-13620

Published

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nvd · CVE-2026-33060

Published

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osv · GHSA-3xm7-qw7j-qc8v

Published

## 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, link-local) 3. Block cloud metadata endpoints (169.254.169.254) 4. Sanitize SQL input for datastore queries 5. SPARQL endpoint allowlist ## Credit Discovered by [Andrei Boldyrev](https://github.com/abcgco) of Munio Security Research using [munio](https://munio.dev)

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Affected versions, risk and source history

Exploitation and risk

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cve-program · CVE-2026-33060

Published

CKAN MCP Server: SSRF via base_url allows access to internal networks

Source published: 20 Mar 2026 07:21:30 UTC
Source modified: 24 Mar 2026 01:56:33 UTC
Saved here: 23 Oct 2026 15:48:27 UTC
Source terms: CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

Source: cve-program · CVE Program Terms of Use. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 3.1 · 5.3 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

euvd · EUVD-2026-13620

Published

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 restr…

Additional publisher context

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

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datePublished: Mar 20, 2026, 7:21:30 AM

dateUpdated: Mar 24, 2026, 1:56:33 AM

Source published: Mar 20, 2026, 7:21:30 AM (timezone not stated)
Source modified: Mar 24, 2026, 1:56:33 AM (timezone not stated)
Saved here: 11 Nov 2026 08:35:09 UTC
Source terms: ENISA EUVD · source terms and attribution apply

Original source record · Cite this exact observation · Complete original publisher JSON

Source: euvd · ENISA EUVD · source terms and attribution apply. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

EUVD CVSS 3.1 · 5.3 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

nvd · CVE-2026-33060

Published

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 restr…

Additional publisher context

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Analyzed

Weakness classifications: CWE-918

Original publisher date fields

published: 2026-03-20T08:16:11.923

lastModified: 2026-06-17T10:36:52.883

1 source CPE criteria · context only

cpe:2.3:a:ondata:ckan_mcp_server:*:*:*:*:*:node.js:*:*

The original JSON retains the logical configuration operators, exclusions and version bounds.

Source published: 20 Mar 2026 08:16:11 UTC
Source modified: 17 Jun 2026 10:36:52 UTC
Saved here: 25 Oct 2026 08:17:18 UTC
Source terms: NIST NVD usage terms; underlying source attribution retained

Original source record · Cite this exact observation · Complete original publisher JSON

Source: nvd · NIST NVD usage terms; underlying source attribution retained. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 3.1 · [email protected] · Secondary · 5.3 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS 3.1 · [email protected] · Primary · 5.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

osv · GHSA-3xm7-qw7j-qc8v

Published

SSRF in @aborruso/ckan-mcp-server via base_url allows access to internal networks

Source published: 18 Mar 2026 12:59:42 UTC
Source modified: 23 Sep 2026 03:56:42 UTC
Saved here: 24 Oct 2026 13:17:17 UTC
Source terms: GitHub Advisory Database · CC-BY-4.0

Original source record · Cite this exact observation · Complete original publisher JSON

Source: osv · GitHub Advisory Database · CC-BY-4.0. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

Publisher rating · MODERATE