CVE-2026-39885

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Source
https://cve.org/CVERecord?id=CVE-2026-39885
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-39885.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-39885
Aliases
Published
2026-04-08T20:34:20.538Z
Modified
2026-07-08T08:13:05.087917277Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
Summary
FrontMCP Affected by SSRF via $ref Dereferencing in Untrusted OpenAPI Specifications
Details

FrontMCP is a TypeScript-first framework for the Model Context Protocol (MCP). Prior to 2.3.0, the mcp-from-openapi library uses @apidevtools/json-schema-ref-parser to dereference $ref pointers in OpenAPI specifications without configuring any URL restrictions or custom resolvers. A malicious OpenAPI specification containing $ref values pointing to internal network addresses, cloud metadata endpoints, or local files will cause the library to fetch those resources during the initialize() call. This enables Server-Side Request Forgery (SSRF) and local file read attacks when processing untrusted OpenAPI specifications. This vulnerability is fixed in 2.3.0.

Database specific 
{
    "unresolved_ranges": [
        {
            "source": "AFFECTED_FIELD",
            "extracted_events": [
                {
                    "fixed": "2.3.0"
                }
            ]
        }
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39885.json",
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-918"
    ]
}
References

Affected packages

Git / github.com/agentfront/frontmcp

Affected ranges

Type
GIT
Repo
https://github.com/agentfront/frontmcp
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
c13e7651968d08223bcf996d4d39f84fe2040c4c
Database specific 
{
    "source": [
        "AFFECTED_FIELD",
        "CPE_RANGE",
        "REFERENCES"
    ],
    "cpe": [
        "cpe:2.3:a:agentfront:\\@frontmcp\\/adapters:*:*:*:*:*:node.js:*:*",
        "cpe:2.3:a:agentfront:\\@frontmcp\\/sdk:*:*:*:*:*:node.js:*:*",
        "cpe:2.3:a:agentfront:frontmcp:*:*:*:*:*:node.js:*:*"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.0.4"
        }
    ]
}

Affected versions

v0.*
v0.2.5
v0.3.0
v0.3.1
v0.4.0
v0.5.0
v0.5.1
v0.6.0
v0.6.1
v0.6.2
v0.6.3
v0.7.1
v0.7.2
v0.8.0
v0.8.1
v1.*
v1.0.0
v1.0.0-beta.1
v1.0.0-beta.10
v1.0.0-beta.11
v1.0.0-beta.12
v1.0.0-beta.13
v1.0.0-beta.14
v1.0.0-beta.2
v1.0.0-beta.3
v1.0.0-beta.4
v1.0.0-beta.5
v1.0.0-beta.6
v1.0.0-beta.7
v1.0.0-beta.8
v1.0.0-beta.9
v1.0.0-rc.1
v1.0.1
v1.0.2
v1.0.3

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-39885.json"