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CVE-2026-53509— @aborruso/ckan-mcp-server: SSRF via base_url allows access to internal networks (Potential fix bypass of CVE-2026-33060)

Quick assessment

Affected
ondata ckan-mcp-server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

onData CKAN MCP Server是onData组织开源的一款用于查询 CKAN 开放数据门户的 MCP 服务器。 onData CKAN MCP Server 0.4.106之前版本存在服务端请求伪造漏洞，该漏洞源于对主机名的验证不严格，导致容易受到服务端请求伪造攻击。

CVSS 5.7 · Medium EPSS 0.38% · P31

Affected Version Matrix 1

VendorProduct Version RangeStatus
ondata ckan-mcp-server < 0.4.106 affected
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I. Basic Information for CVE-2026-53509

Vulnerability Information
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Vulnerability Title
@aborruso/ckan-mcp-server: SSRF via base_url allows access to internal networks (Potential fix bypass of CVE-2026-33060)
Source: CVE Program / CVE List V5
Vulnerability Description
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`.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
onData CKAN MCP Server 服务端请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
onData CKAN MCP Server是onData组织开源的一款用于查询 CKAN 开放数据门户的 MCP 服务器。 onData CKAN MCP Server 0.4.106之前版本存在服务端请求伪造漏洞，该漏洞源于对主机名的验证不严格，导致容易受到服务端请求伪造攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ondata ckan-mcp-server < 0.4.106 -

II. Public POCs for CVE-2026-53509

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III. Intelligence Information for CVE-2026-53509

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Patches & Fixes for CVE-2026-53509 (1)

Vendor Advisories for CVE-2026-53509 (2)

IV. Related Vulnerabilities

Same product: ckan-mcp-server
Same vendor: ondata
Same weakness: CWE-918

V. Comments for CVE-2026-53509

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