FrontMCP and mcp-from-openapi have bypass of OpenAPI external $ref SSRF fix

Summary The published fix for GHSA-v6ph-xcq9-qxxj / CVE-2026-39885 added a direct hostname denylist for OpenAPI external $ref dereferencing, but the latest patched dependency mcp-from-openapi 2.3.0 still makes backend-origin requests to loopback when the target is reached through hostname...

FrontMCP: Server-Side Request Forgery (SSRF) in the OpenAPI adapter spec-change poller

Summary The OpenAPI adapter's spec-change poller OpenApiSpecPoller re-fetched the configured spec url on a timer using a raw global fetch, bypassing the SSRF guard safeFetch / assertUrlSafe that OpenAPIToolGenerator.fromURL applies to the initial spec load. As a result, the pinning/DNS-resolution...

GHSA-8Q49-2H5H-434X FrontMCP: Server-Side Request Forgery (SSRF) in the OpenAPI adapter spec-change poller

Summary The OpenAPI adapter's spec-change poller OpenApiSpecPoller re-fetched the configured spec url on a timer using a raw global fetch, bypassing the SSRF guard safeFetch / assertUrlSafe that OpenAPIToolGenerator.fromURL applies to the initial spec load. As a result, the pinning/DNS-resolution...

PT-2026-67592

Summary The OpenAPI adapter's spec-change poller OpenApiSpecPoller re-fetched the configured spec url on a timer using a raw global fetch, bypassing the SSRF guard safeFetch / assertUrlSafe that OpenAPIToolGenerator.fromURL applies to the initial spec load. As a result, the pinning/DNS-resolution...