GHSA-g84h-j7jj-x32p: @aborruso/ckan-mcp-server: SSRF via base_url allows access to internal networks (Potential fix bypass of CVE-2026-33060)
A Server-Side Request Forgery (SSRF) vulnerability exists in @aborruso/ckan-mcp-server versions prior to 0.4.106. The issue arises because the server validates only the hostname string when processing caller-supplied base_url parameters, allowing hostname aliases like 'ip6-localhost' to bypass filters and resolve to loopback addresses. This enables remote attackers to make the server connect to internal or private network addresses and potentially access response data. A fix was implemented by expanding the blocked hostname list to include these aliases.
AI Analysis
Technical Summary
The vulnerability (CVE-2026-53509) in @aborruso/ckan-mcp-server involves insufficient hostname validation in the base_url parameter used by CKAN tools. The server only checked if the hostname was exactly 'localhost' to block SSRF attempts, but aliases such as 'ip6-localhost' were not blocked and resolved to loopback addresses. This allowed attackers to bypass the SSRF filter and make the server perform HTTP requests to internal network endpoints, potentially exposing sensitive data from CKAN-shaped responses. The issue was addressed by replacing the single hostname check with a set of blocked hostnames including 'ip6-localhost' and 'ip6-loopback'.
Potential Impact
An attacker with the ability to invoke CKAN tools with a server_url parameter can cause the server to make HTTP requests to internal or private network addresses. This can lead to unauthorized access to internal network resources or data leakage from internal services responding with CKAN-shaped data. The vulnerability does not impact integrity or availability but has a high confidentiality impact.
Mitigation Recommendations
A fix is available in versions 0.4.106 and later, which expands the blocked hostname list to cover hostname aliases that resolve to loopback addresses. Users should upgrade to version 0.4.106 or later to remediate this vulnerability. No additional mitigation is indicated by the vendor advisory.
GHSA-g84h-j7jj-x32p: @aborruso/ckan-mcp-server: SSRF via base_url allows access to internal networks (Potential fix bypass of CVE-2026-33060)
Description
A Server-Side Request Forgery (SSRF) vulnerability exists in @aborruso/ckan-mcp-server versions prior to 0.4.106. The issue arises because the server validates only the hostname string when processing caller-supplied base_url parameters, allowing hostname aliases like 'ip6-localhost' to bypass filters and resolve to loopback addresses. This enables remote attackers to make the server connect to internal or private network addresses and potentially access response data. A fix was implemented by expanding the blocked hostname list to include these aliases.
CVSS v3.1
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability (CVE-2026-53509) in @aborruso/ckan-mcp-server involves insufficient hostname validation in the base_url parameter used by CKAN tools. The server only checked if the hostname was exactly 'localhost' to block SSRF attempts, but aliases such as 'ip6-localhost' were not blocked and resolved to loopback addresses. This allowed attackers to bypass the SSRF filter and make the server perform HTTP requests to internal network endpoints, potentially exposing sensitive data from CKAN-shaped responses. The issue was addressed by replacing the single hostname check with a set of blocked hostnames including 'ip6-localhost' and 'ip6-loopback'.
Potential Impact
An attacker with the ability to invoke CKAN tools with a server_url parameter can cause the server to make HTTP requests to internal or private network addresses. This can lead to unauthorized access to internal network resources or data leakage from internal services responding with CKAN-shaped data. The vulnerability does not impact integrity or availability but has a high confidentiality impact.
Mitigation Recommendations
A fix is available in versions 0.4.106 and later, which expands the blocked hostname list to cover hostname aliases that resolve to loopback addresses. Users should upgrade to version 0.4.106 or later to remediate this vulnerability. No additional mitigation is indicated by the vendor advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-g84h-j7jj-x32p
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-53509"]
- Ecosystems
- ["npm"]
- Database Specific Severity
- MODERATE
- Cvss Version
- 3.1
Threat ID: 6a4e4efcc9d9e3dbe328d014
Added to database: 07/08/2026, 13:22:04 UTC
Last enriched: 07/08/2026, 13:46:55 UTC
Last updated: 07/08/2026, 13:46:55 UTC
Views: 2
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