CVE-2025-43855

tRPC 11 WebSocket DoS 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.

Category

8.7
CVSS
Severity: High
CVSS 4.0 •
EPSS 0.10%
Affected: trpc trpc
Published at:
Updated at:

References

Link Tags
https://github.com/trpc/trpc/security/advisories/GHSA-pj3v-9cm8-gvj8
https://github.com/trpc/trpc/commit/9beb26c636d44852e0f407f3d7a82ad54df65b4d

Frequently Asked Questions

What is the severity of CVE-2025-43855?
CVE-2025-43855 has been scored as a high severity vulnerability.
How to fix CVE-2025-43855?
To fix CVE-2025-43855, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-43855 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-43855 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-43855?
CVE-2025-43855 affects trpc trpc.
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