CVE-2026-53509: @aborruso/ckan-mcp-server SSRF Vulnerability
MODERATECVE-2026-53509 is a MODERATE (CVSS 5.7) ssrf vulnerability (CWE-918: Server-Side Request Forgery (SSRF)) affecting @aborruso/ckan-mcp-server libraries in the npm ecosystem. The issue involves ssrf via base_url allows access to internal networks (potential fix bypass of cve-2026-33060). Remediation is available by upgrading affected packages to version 0.4.106.
CVE-2026-53509 at a Glance
Security Impact
CVSS: 5.7
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N).
How to Fix CVE-2026-53509
To remediate this vulnerability, upgrade all affected @aborruso/ckan-mcp-server dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
npm install @aborruso/ckan-mcp-server@0.4.106Run the following command in your project directory to verify that all resolved dependencies use the patched release:
npm ls @aborruso/ckan-mcp-serverHow to Check if You Are Affected
To determine whether your Node.js application is affected by CVE-2026-53509, inspect your project dependencies using npm:
npm ls @aborruso/ckan-mcp-serverAnalyze the terminal output to locate any version of @aborruso/ckan-mcp-server in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.4.106), your application is affected.
Note: The npm ls @aborruso/ckan-mcp-server command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-918: Server-Side Request Forgery (SSRF), where the web server receives a url or similar request from an upstream component and retrieves the contents of this url, but it does not sufficiently ensure that the request is being sent to the expected destination. In @aborruso/ckan-mcp-server, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2026-53509 Affected @aborruso/ckan-mcp-server Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
@aborruso/ckan-mcp-server
|
npm |
< 0.4.106
|
0.4.106
|
References
Frequently Asked Questions
What is CVE-2026-53509?
Which @aborruso/ckan-mcp-server versions are affected?
What version fixes CVE-2026-53509?
Is @aborruso/ckan-mcp-server affected?
What is the CVSS score of CVE-2026-53509?
What CWE is associated with CVE-2026-53509?
How can I check npm dependencies for CVE-2026-53509?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-g84h-j7jj-x32p",
"modified" : "2026-07-07T19:35:57Z",
"published" : "2026-07-07T19:35:57Z",
"aliases" : [ "CVE-2026-53509" ],
"summary" : "@aborruso/ckan-mcp-server: SSRF via base_url allows access to internal networks (Potential fix bypass of CVE-2026-33060)",
"details" : "### Summary\nA 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.\n\n### Details\nCKAN 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.\n\n### Fix\nReplaced the single `hostname === 'localhost'` check with a blocked-hostname `Set` covering `ip6-localhost` and `ip6-loopback`. Patched in commit `c761045a1b7c5f40d2626540dd2ef1d4feb91f8c`.\n\n---\n@aborruso/ckan-mcp-server thanks **hibrian827** for responsibly disclosing this issue.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "npm",
"name" : "@aborruso/ckan-mcp-server"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "0.4.106"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/ondata/ckan-mcp-server/security/advisories/GHSA-g84h-j7jj-x32p"
}, {
"type" : "ADVISORY",
"url" : "https://github.com/advisories/GHSA-3xm7-qw7j-qc8v"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/ondata/ckan-mcp-server"
}, {
"type" : "WEB",
"url" : "https://github.com/ondata/ckan-mcp-server/releases/tag/v0.4.106"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-918" ],
"severity" : "MODERATE",
"github_reviewed" : true,
"github_reviewed_at" : "2026-07-07T19:35:57Z",
"nvd_published_at" : null
}
}