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.
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Affected Vendors & Products
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History
Thu, 09 Apr 2026 17:15:00 +0000
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ssvc
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Thu, 09 Apr 2026 08:30:00 +0000
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Agentfront
Agentfront frontmcp Frontmcp Frontmcp mcp-from-openapi |
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Agentfront
Agentfront frontmcp Frontmcp Frontmcp mcp-from-openapi |
Wed, 08 Apr 2026 20:45:00 +0000
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| Description | 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. | |
| Title | FrontMCP Affected by SSRF via $ref Dereferencing in Untrusted OpenAPI Specifications | |
| Weaknesses | CWE-918 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-04-08T20:34:20.538Z
Updated: 2026-04-09T16:16:59.067Z
Reserved: 2026-04-07T20:32:03.010Z
Link: CVE-2026-39885
Updated: 2026-04-09T14:53:28.220Z
Status : Awaiting Analysis
Published: 2026-04-08T21:17:00.833
Modified: 2026-04-09T17:16:29.533
Link: CVE-2026-39885
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