How severe is CVE-2025-43855?

This vulnerability has a severity rating of HIGH with a CVSS score of N/A out of 10.

What type of vulnerability is CVE-2025-43855?

This is classified as CWE-248, which is a common weakness in software security.

CVE-2025-43855 - HIGH Severity | CVSS N/A

Vulnerability Description

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.

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