CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NCVE-2026-39885
High (7.5). EPSS 0.4% chance of exploitation in the next 30 days. Fixed in mcp-from-openapi 2.3.0.
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.
Severity
- EPSS
- 0.4% chance of exploitation in the next 30 days; higher than 33% of CVEs (scores of 2026-11-01)
- CWE
- CWE-918
- Published
- Modified
- Record from
- the NVD, synced
Affected
- agentfront:\@frontmcp\/adapters
- agentfront:\@frontmcp\/sdk
- agentfront:frontmcp
- frontmcp:mcp-from-openapi
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-v6ph-xcq9-qxxj | npm | mcp-from-openapi | <2.3.0 | 2.3.0 |
| GHSA-v6ph-xcq9-qxxj | npm | @frontmcp/sdk | <1.0.4 | 1.0.4 |
| GHSA-v6ph-xcq9-qxxj | npm | @frontmcp/adapters | <1.0.4 | 1.0.4 |