Vulnerability Details CVE-2026-39885
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 12.5%
CVSS Severity
CVSS v3 Score 7.5
References
Products affected by CVE-2026-39885
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cpe:2.3:a:agentfront:@frontmcp/adapters:0.1.2
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cpe:2.3:a:agentfront:@frontmcp/adapters:0.10.0
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cpe:2.3:a:agentfront:@frontmcp/adapters:0.11.0
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cpe:2.3:a:agentfront:@frontmcp/adapters:0.11.1
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cpe:2.3:a:agentfront:@frontmcp/adapters:0.11.2
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cpe:2.3:a:agentfront:@frontmcp/adapters:0.11.3
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cpe:2.3:a:agentfront:@frontmcp/adapters:0.12.0
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cpe:2.3:a:agentfront:@frontmcp/adapters:0.12.1
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cpe:2.3:a:agentfront:@frontmcp/adapters:0.12.2
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cpe:2.3:a:agentfront:@frontmcp/adapters:0.3.0
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cpe:2.3:a:agentfront:@frontmcp/adapters:0.3.1
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cpe:2.3:a:agentfront:@frontmcp/adapters:0.4.0
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cpe:2.3:a:agentfront:@frontmcp/adapters:0.5.0
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cpe:2.3:a:agentfront:@frontmcp/adapters:0.5.1
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cpe:2.3:a:agentfront:@frontmcp/adapters:0.6.0
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cpe:2.3:a:agentfront:@frontmcp/adapters:0.6.1
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cpe:2.3:a:agentfront:@frontmcp/adapters:0.6.2
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cpe:2.3:a:agentfront:@frontmcp/adapters:0.6.3
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cpe:2.3:a:agentfront:@frontmcp/adapters:0.7.1
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cpe:2.3:a:agentfront:@frontmcp/adapters:0.7.2
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cpe:2.3:a:agentfront:@frontmcp/adapters:0.8.0
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cpe:2.3:a:agentfront:@frontmcp/adapters:0.8.1
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cpe:2.3:a:agentfront:@frontmcp/adapters:0.9.0
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cpe:2.3:a:agentfront:@frontmcp/adapters:1.0.0
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cpe:2.3:a:agentfront:@frontmcp/adapters:1.0.1
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cpe:2.3:a:agentfront:@frontmcp/adapters:1.0.2
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cpe:2.3:a:agentfront:@frontmcp/adapters:1.0.3
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cpe:2.3:a:agentfront:@frontmcp/sdk:0.1.0
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cpe:2.3:a:agentfront:@frontmcp/sdk:0.10.0
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cpe:2.3:a:agentfront:@frontmcp/sdk:0.11.0
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cpe:2.3:a:agentfront:@frontmcp/sdk:0.11.1
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cpe:2.3:a:agentfront:@frontmcp/sdk:0.11.2
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cpe:2.3:a:agentfront:@frontmcp/sdk:0.11.3
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cpe:2.3:a:agentfront:@frontmcp/sdk:0.12.0
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cpe:2.3:a:agentfront:@frontmcp/sdk:0.12.1
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cpe:2.3:a:agentfront:@frontmcp/sdk:0.12.2
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cpe:2.3:a:agentfront:@frontmcp/sdk:0.3.0
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cpe:2.3:a:agentfront:@frontmcp/sdk:0.3.1
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cpe:2.3:a:agentfront:@frontmcp/sdk:0.4.0
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cpe:2.3:a:agentfront:@frontmcp/sdk:0.5.1
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cpe:2.3:a:agentfront:@frontmcp/sdk:0.6.0
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cpe:2.3:a:agentfront:@frontmcp/sdk:0.6.2
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cpe:2.3:a:agentfront:@frontmcp/sdk:0.6.3
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cpe:2.3:a:agentfront:@frontmcp/sdk:0.7.1
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cpe:2.3:a:agentfront:@frontmcp/sdk:0.7.2
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cpe:2.3:a:agentfront:@frontmcp/sdk:0.8.0
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cpe:2.3:a:agentfront:@frontmcp/sdk:0.8.1
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cpe:2.3:a:agentfront:@frontmcp/sdk:0.9.0
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cpe:2.3:a:agentfront:@frontmcp/sdk:1.0.0
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cpe:2.3:a:agentfront:@frontmcp/sdk:1.0.1
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cpe:2.3:a:agentfront:@frontmcp/sdk:1.0.2
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cpe:2.3:a:agentfront:@frontmcp/sdk:1.0.3
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cpe:2.3:a:agentfront:frontmcp:0.1.0
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cpe:2.3:a:agentfront:frontmcp:0.1.1
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cpe:2.3:a:agentfront:frontmcp:0.1.2
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cpe:2.3:a:agentfront:frontmcp:0.1.3
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cpe:2.3:a:agentfront:frontmcp:0.10.0
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cpe:2.3:a:agentfront:frontmcp:0.11.0
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cpe:2.3:a:agentfront:frontmcp:0.11.1
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cpe:2.3:a:agentfront:frontmcp:0.11.2
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cpe:2.3:a:agentfront:frontmcp:0.11.3
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cpe:2.3:a:agentfront:frontmcp:0.12.0
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cpe:2.3:a:agentfront:frontmcp:0.12.1
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cpe:2.3:a:agentfront:frontmcp:0.12.2
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cpe:2.3:a:agentfront:frontmcp:0.2.0
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cpe:2.3:a:agentfront:frontmcp:0.2.1
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cpe:2.3:a:agentfront:frontmcp:0.2.5
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cpe:2.3:a:agentfront:frontmcp:0.3.0
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cpe:2.3:a:agentfront:frontmcp:0.3.1
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cpe:2.3:a:agentfront:frontmcp:0.4.0
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cpe:2.3:a:agentfront:frontmcp:0.4.1
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cpe:2.3:a:agentfront:frontmcp:0.5.0
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cpe:2.3:a:agentfront:frontmcp:0.5.1
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cpe:2.3:a:agentfront:frontmcp:0.6.0
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cpe:2.3:a:agentfront:frontmcp:0.6.1
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cpe:2.3:a:agentfront:frontmcp:0.6.2
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cpe:2.3:a:agentfront:frontmcp:0.6.3
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cpe:2.3:a:agentfront:frontmcp:0.7.1
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cpe:2.3:a:agentfront:frontmcp:0.7.2
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cpe:2.3:a:agentfront:frontmcp:0.8.0
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cpe:2.3:a:agentfront:frontmcp:0.8.1
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cpe:2.3:a:agentfront:frontmcp:0.9.0
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cpe:2.3:a:agentfront:frontmcp:1.0.0
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cpe:2.3:a:agentfront:frontmcp:1.0.1
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cpe:2.3:a:agentfront:frontmcp:1.0.2
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cpe:2.3:a:agentfront:frontmcp:1.0.3
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cpe:2.3:a:frontmcp:mcp-from-openapi:*