CVE-2026-53509

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Source
https://cve.org/CVERecord?id=CVE-2026-53509
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53509.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-53509
Aliases
Related
Published
2026-08-21T21:21:20.897Z
Modified
2026-08-23T03:53:38.928609557Z
Severity
  • 5.7 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N CVSS Calculator
Summary
@aborruso/ckan-mcp-server: SSRF via base_url allows access to internal networks (Potential fix bypass of CVE-2026-33060)
Details

CKAN MCP Server is a tool for querying CKAN open data portals. A known vulnerability CVE-2026-33060 indicated tools including ckanpackagesearch and sparqlquery that accept a baseurl 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.

Database specific 
{
    "cwe_ids": [
        "CWE-918"
    ],
    "cna_assigner": "GitHub_M",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53509.json"
}
References

Affected packages

Git / github.com/ondata/ckan-mcp-server

Affected ranges

Type
GIT
Repo
https://github.com/ondata/ckan-mcp-server
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
433464712c590ef6b353fa69ecfefbeb27de8cb7
Database specific
Show details 
{
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "0.4.106"
        }
    ]
}

Affected versions

v0.*
v0.3.0
v0.3.1
v0.3.2
v0.4.0
v0.4.1
v0.4.10
v0.4.100
v0.4.101
v0.4.102
v0.4.103
v0.4.105
v0.4.11
v0.4.12
v0.4.13
v0.4.14
v0.4.15
v0.4.16
v0.4.17
v0.4.18
v0.4.19
v0.4.2
v0.4.20
v0.4.21
v0.4.22
v0.4.23
v0.4.24
v0.4.25
v0.4.26
v0.4.27
v0.4.28
v0.4.29
v0.4.3
v0.4.30
v0.4.31
v0.4.32
v0.4.33
v0.4.34
v0.4.35
v0.4.36
v0.4.37
v0.4.38
v0.4.39
v0.4.4
v0.4.40
v0.4.41
v0.4.42
v0.4.43
v0.4.44
v0.4.45
v0.4.46
v0.4.47
v0.4.48
v0.4.49
v0.4.5
v0.4.50
v0.4.51
v0.4.52
v0.4.53
v0.4.54
v0.4.55
v0.4.56
v0.4.57
v0.4.58
v0.4.59
v0.4.6
v0.4.60
v0.4.61
v0.4.62
v0.4.63
v0.4.64
v0.4.65
v0.4.66
v0.4.67
v0.4.68
v0.4.69
v0.4.7
v0.4.71
v0.4.72
v0.4.73
v0.4.74
v0.4.75
v0.4.76
v0.4.77
v0.4.78
v0.4.79
v0.4.8
v0.4.80
v0.4.81
v0.4.82
v0.4.83
v0.4.84
v0.4.85
v0.4.86
v0.4.87
v0.4.88
v0.4.89
v0.4.9
v0.4.90
v0.4.91
v0.4.92
v0.4.93
v0.4.94
v0.4.95
v0.4.96
v0.4.97
v0.4.98
v0.4.99

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53509.json"