CVE-2025-23167 – Node.js HTTP Smuggling Vulnerability

CVE ID : CVE-2025-23167

Published : May 19, 2025, 2:15 a.m. | 51 minutes ago

Description : A flaw in Node.js 20’s HTTP parser allows improper termination of HTTP/1 headers using `rnrX` instead of the required `rnrn`.
This inconsistency enables request smuggling, allowing attackers to bypass proxy-based access controls and submit unauthorized requests.

The issue was resolved by upgrading `llhttp` to version 9, which enforces correct header termination.

Impact:
* This vulnerability affects only Node.js 20.x users prior to the `llhttp` v9 upgrade.

Severity: 6.5 | MEDIUM

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