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CVE-2025-43855— tRPC 11 WebSocket DoS Vulnerability

Quick assessment

Affected
trpc trpc
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

tRPC是tRPC社区的一个用于构建类型安全的API的TypeScript框架。 tRPC 11.0.0版本存在安全漏洞，该漏洞源于未处理错误，可能导致WebSocket服务器崩溃。

AI Predicted 7.5 Difficulty: Easy EPSS 0.40% · P33

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-43855

Vulnerability Information
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Vulnerability Title
tRPC 11 WebSocket DoS Vulnerability
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未捕获的异常
Source: CVE Program / CVE List V5
Vulnerability Title
tRPC 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
tRPC是tRPC社区的一个用于构建类型安全的API的TypeScript框架。 tRPC 11.0.0版本存在安全漏洞，该漏洞源于未处理错误，可能导致WebSocket服务器崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
trpc trpc >= 11.0.0, < 11.1.1 -

II. Public POCs for CVE-2025-43855

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III. Intelligence Information for CVE-2025-43855

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Patches & Fixes for CVE-2025-43855 (1)

Vendor Advisories for CVE-2025-43855 (1)

IV. Related Vulnerabilities

Same product: trpc
Same vendor: trpc
Same weakness: CWE-248

V. Comments for CVE-2025-43855

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