Frontmcp: community verdicts

1 notable / known-exploited Frontmcp CVE the community has triaged.

ⓘ Not an exhaustive list: we focus on the findings that matter (exploited / notable). For every Frontmcp CVE, see NVD ↗.

CVE-2026-39885HIGH 7.5Real · low riskEPSS 0%
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.