CVE-2026-59973 mcp-from-openapi: Bypass of OpenAPI external $ref SSRF fix in latest FrontMCP and mcp-from-openapi

FrontMCP is a TypeScript-first framework for the Model Context Protocol MCP. From mcp-from-openapi 2.3.0 until 2.5.0 and from frontmcp and @frontmcp/adapters 1.2.1 until 1.5.0, libs/adapters/src/openapi/openapi.adapter.ts loadOpenAPISpec forwards untrusted OpenAPI url and spec inputs and...

CVE-2026-59973 mcp-from-openapi: Bypass of OpenAPI external $ref SSRF fix in latest FrontMCP and mcp-from-openapi

FrontMCP is a TypeScript-first framework for the Model Context Protocol MCP. From mcp-from-openapi 2.3.0 until 2.5.0 and from frontmcp and @frontmcp/adapters 1.2.1 until 1.5.0, libs/adapters/src/openapi/openapi.adapter.ts loadOpenAPISpec forwards untrusted OpenAPI url and spec inputs and...

CVE-2026-59973: Server-Side Request Forgery (SSRF)

FrontMCP is a TypeScript-first framework for the Model Context Protocol MCP. From mcp-from-openapi 2.3.0 until 2.5.0 and from frontmcp and @frontmcp/adapters 1.2.1 until 1.5.0, libs/adapters/src/openapi/openapi.adapter.ts loadOpenAPISpec forwards untrusted OpenAPI url and spec inputs and...

@frontmcp/adapters (>=1.0.4, <=1.5.0-rc.1), @frontmcp/plugin-skilled-openapi (>=0.0.1, <=1.5.0-rc.1) potentially affected by CVE-2026-59973 via mcp-from-openapi (>=2.3.0, <=2.4.0)

mcp-from-openapi NPM version =2.3.0, =1.0.4, =0.0.1, =1.5.0-rc.1 Source cves: CVE-2026-59973 Source advisory: OSV:GHSA-65H7-9WRW-629C...

GHSA-65H7-9WRW-629C 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...

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

NPM: FrontMCP and mcp-from-openapi have bypass of OpenAPI external $ref SSRF fix vulnerability discovered by ? in WordPress Npm mcp-from-openapi versions = 2.3.0, 2.5.0...

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...

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

NPM: FrontMCP and mcp-from-openapi have bypass of OpenAPI external $ref SSRF fix vulnerability discovered by ? in WordPress Npm frontmcp versions = 1.2.1, 1.5.0...

PT-2026-90548

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...

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 OpenA...

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 OpenA...

CVE-2026-39885

CVE-2026-39885 affects FrontMCP (prior to 2.3.0) via the mcp-from-openapi library, which dereferences $ref in OpenAPI specs without URL restrictions, enabling SSRF and local file reads when processing untrusted specs. Fixed in 2.3.0. CVSS v3.1 base score 7.5 (HIGH). Exploitation status not provid...

CVE-2026-39885 FrontMCP Affected by SSRF via $ref Dereferencing in Untrusted OpenAPI Specifications

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 OpenA...

@frontmcp/adapters (>=0.5.0, <=1.0.3), frontmcp (0.5.0) potentially affected by CVE-2026-39885 via mcp-from-openapi (>=2.0.0, <=2.1.2)

mcp-from-openapi NPM version =2.0.0, =0.5.0, =1.0.3 - frontmcp 0.5.0 Source cves: CVE-2026-39885 Source advisory: OSV:GHSA-V6PH-XCQ9-QXXJ...

CVE-2026-39885: Server-Side Request Forgery (SSRF)

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 OpenA...