8.7

CVE-2025-43855: trpc Uncaught Exception

CVSS: 8.7v4.0HighDeferred
AliasesGHSA-pj3v-9cm8-gvj8
Published 24-04-2025Last modified 14-05-2025
Open JSON

Vulnerability summary

CVE-2025-43855 is a high (CVSS 8.7) Uncaught Exception vulnerability in trpc. EPSS estimates a 0.42% chance of exploitation in the next 30 days, higher than 34.7% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.7/10
010
High · v4.0 (CVE.org)
EPSS score
0.42%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 24-04-2025
    PublishedVulnerability first disclosed.
  2. 14-05-2025
    Last modifiedVulnerability information updated.

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.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.42%

Chance of exploitation in the next 30 days

Percentile

35%

Versus all other CVEs

30-day change

0.00 pp

From 0.42% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.42%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

@trpc1 product
  • server≥ 11.0.0, < 11.1.1
Trpc1 product
  • trpc≥ 11.0.0, < 11.1.1

2 vendors · 2 products

References

6 links