Internal data disclosure via loopback hostname aliases
Published Aug 21, 2026 · Updated Aug 21, 2026
SSRF in onData CKAN MCP Server before 0.4.106 allows remote authenticated users to read internal CKAN data through crafted server URLs. The validateServerUrl logic in src/utils/http.ts compares the parsed hostname as a string, so Linux aliases such as ip6-localhost bypass literal loopback checks and resolve to ::1. Exploitation requires permission to invoke CKAN tools and a target endpoint returning a CKAN-shaped response, limiting disclosure to response-derived data.
Summary
What happened
SSRF in onData CKAN MCP Server before 0.4.106 allows remote authenticated users to read internal CKAN data through crafted server URLs. The validateServerUrl logic in src/utils/http.ts compares the parsed hostname as a string, so Linux aliases such as ip6-localhost bypass literal loopback checks and resolve to ::1. Exploitation requires permission to invoke CKAN tools and a target endpoint returning a CKAN-shaped response, limiting disclosure to response-derived data.
The record
- CVE
- CVE-2026-53509
- Published
- Aug 21, 2026
- Updated
- Aug 21, 2026
- Vendor
- onData
- Product
- CKAN MCP Server
- Classifications
- CWE-918, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 21, 2026CVE publishedPublication date reported by the CVE source.
- Aug 21, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 0.4.106
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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