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Vulnerabilities

Security fix · CVE-2025-43855

tRPC allows users to build & consume fully typesafe APIs without schemas or code generation.

Published Apr 24, 2025 · catalog updated May 14, 2025 · tRPC allows users to

Check if you run it

No confirmed exploitation is on record for CVE-2025-43855. EPSS is 0.42%. Act only if a listed version of tRPC allows users to is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (tRPC allows users to).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.7
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.42%
Remediation
Version ranges on file
Affected products
vendor trpc trpc 11.0.0, < 11.1.1

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor trpc trpc 11.0.0, < 11.1.111.0.0, < 11.1.1

How to fix CVE-2025-43855

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-43855. EPSS is 0.42%. Act only if a listed version of tRPC allows users to is installed.

Which versions are affected?

Compare what you have installed with trpc trpc 11.0.0, < 11.1.1 11.0.0, < 11.1.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.42%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 24, 2025 · EUVD

    Detected

    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

  2. May 14, 2025 · EUVD

    Updated

    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

Sources

  • CVE.orgVulnerability recordCVE-2025-43855

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-43855

    30-day exploitation probability 0.4%

    first.org
  • EUVDVulnerability recordEUVD-2025-12106

    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 unauthentic

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.