CVE-2025-43855 — tRPC 11 WebSocket DoS Vulnerability
tRPC allows users to build & consume fully typesafe APIs without schemas or code generation. In versions starting from 11.0.0 to before 11.1.1, an unhandled error is thrown when…
Published: 2025-04-24 · CVSS: 8.7 · CVSS 4.0
tRPC allows users to build & consume fully typesafe APIs without schemas or code generation. In versions starting from 11.0.0 to before 11.1.1, an unhandled error is thrown when validating invalid connectionParams which crashes a tRPC WebSocket server. This allows any unauthenticated user to crash a tRPC 11 WebSocket server. Any tRPC 11 server with WebSocket enabled with a createContext method set is vulnerable. This issue has been patched in version 11.1.1.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7