CVE-2026-39885
High · 7.5CVSS
7.5
EPSS
0.4%
Published
Apr 8, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| npm | @frontmcp/adapters | 0 | 1.0.4 |
| npm | @frontmcp/sdk | 0 | 1.0.4 |
| npm | mcp-from-openapi | 0 | 2.3.0 |
Related vulnerabilities
- GHSA-v6ph-xcq9-qxxj mcp-from-openapi is Vulnerable to SSRF via $ref Dereferencing in Untrusted OpenAPI… Same vulnerability
- CVE-2026-114730 Roundcube Webmail 1.6.14 before 1.6.20 and 1.7.0 before 1.7.5 is affected by a… CWE-918
- CVE-2026-87953 Server-Side Request Forgery (SSRF) vulnerability in Drupal SAML SSO - Service Provider… CWE-918
- CVE-2026-114634 WWBN AVideo before 29.4.0 contains a blind server-side request forgery vulnerability in… CWE-918
- CVE-2026-112288 Krayin CRM 2.2.5 before 2.2.7 contains a server-side request forgery filter bypass that… CWE-918
- CVE-2026-111936 Sigma File Manager through 2.2.0 contains a server-side request forgery vulnerability… CWE-918
- CVE-2026-94483 Next.js is a React framework for building full-stack web applications. CWE-918
- CVE-2026-102267 PyJWT is a Python implementation of JSON Web Token standards. CWE-918