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-2026-67531

FrontMCP is a TypeScript-first framework for the Model Context Protocol MCP. Prior to 1.5.7, the sandboxed codecall:execute tool exposes live host Zod schema instances to the script via getTool, and because Zod v4 defines zod as a non-configurable, non-writable own property, the ECMAScript Proxy...

CVE-2026-67531 FrontMCP: CodeCall sandbox escape -> host RCE via live Zod schema exposure by getTool

FrontMCP is a TypeScript-first framework for the Model Context Protocol MCP. Prior to 1.5.7, the sandboxed codecall:execute tool exposes live host Zod schema instances to the script via getTool, and because Zod v4 defines zod as a non-configurable, non-writable own property, the ECMAScript Proxy...

CVE-2026-67531

FrontMCP is a TypeScript-first framework for the Model Context Protocol MCP. Prior to 1.5.7, the sandboxed codecall:execute tool exposes live host Zod schema instances to the script via getTool, and because Zod v4 defines zod as a non-configurable, non-writable own property, the ECMAScript Proxy...

CVE-2026-67531 FrontMCP: CodeCall sandbox escape -> host RCE via live Zod schema exposure by getTool

FrontMCP is a TypeScript-first framework for the Model Context Protocol MCP. Prior to 1.5.7, the sandboxed codecall:execute tool exposes live host Zod schema instances to the script via getTool, and because Zod v4 defines zod as a non-configurable, non-writable own property, the ECMAScript Proxy...

CVE-2026-67531

CVE-2026-67531 affects FrontMCP before 1.5.7. The sandboxed codecall:execute tool could leak live host Zod schema instances to scripts via getTool, and due to Zod v4 _zod being non-configurable/non-writable, the ECMAScript Proxy invariant returned the raw host object. This allowed a script to rea...

EUVD-2026-53684

FrontMCP is a TypeScript-first framework for the Model Context Protocol MCP. Prior to 1.5.7, the sandboxed codecall:execute tool exposes live host Zod schema instances to the script via getTool, and because Zod v4 defines zod as a non-configurable, non-writable own property, the ECMAScript Proxy...

@frontmcp/plugin-skilled-openapi (>=0.0.1, <=1.5.5) potentially affected by unknown CVE via @frontmcp/adapters (>=1.0.4, <=1.5.5)

@frontmcp/adapters NPM version =1.0.4, =0.0.1, =1.5.5 Source cves: unknown CVE Source advisory: OSV:GHSA-8Q49-2H5H-434X...

Server-side Request Forgery (SSRF)

Overview @frontmcp/sdk is a FrontMCP SDK Affected versions of this package are vulnerable to Server-side Request Forgery SSRF in the initialize process. An attacker can access internal network resources or sensitive local files by submitting a crafted OpenAPI specification containing malicious $r...

Server-side Request Forgery (SSRF)

Overview @frontmcp/adapters is an Adapters for the FrontMCP framework Affected versions of this package are vulnerable to Server-side Request Forgery SSRF in the initialize process. An attacker can access internal network resources or sensitive local files by submitting a crafted OpenAPI...

@frontmcp/adapters (>=1.0.0-beta.1, <=1.0.3), @frontmcp/plugin-approval (>=1.0.0-beta.1, <=1.0.3) +7 more potentially affected by CVE-2026-39885 via @frontmcp/sdk (>=1.0.0, <=1.0.3)

@frontmcp/sdk NPM version =1.0.0, =1.0.0-beta.1, =1.0.0-beta.1, =1.0.0-beta.1, =1.0.0-beta.1, =1.0.0-beta.1, =0.0.1, =1.0.0-beta.1, =1.0.0-beta.1, =0.0.1, =1.0.3 Source cves: CVE-2026-39885 Source advisory: SNYK:JS-FRONTMCPSDK-16423474...

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...

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...

@frontmcp/adapters (>=1.0.0-beta.1, <=1.0.3), @frontmcp/plugin-approval (>=1.0.0-beta.1, <=1.0.3) +7 more potentially affected by CVE-2026-39885 via @frontmcp/sdk (>=1.0.0, <=1.0.3)

@frontmcp/sdk NPM version =1.0.0, =1.0.0-beta.1, =1.0.0-beta.1, =1.0.0-beta.1, =1.0.0-beta.1, =1.0.0-beta.1, =0.0.1, =1.0.0-beta.1, =1.0.0-beta.1, =0.0.1, =1.0.3 Source cves: CVE-2026-39885 Source advisory: OSV:GHSA-V6PH-XCQ9-QXXJ...