CVE-2025-23167 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.

Published May 31, 2026