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CVE-2025-23167

Updated on 19 May 2025

Severity

6.5 Medium severity

Details

CVSS score
6.5
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CWE ID
Links
NISTCIRCLRHELUbuntu

Overview

About vulnerability

A flaw in Node.js 20’s HTTP parser allows improper termination of HTTP/1 headers using \r\n\rX instead of the required \r\n\r\n. 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.

Details

Affected product:
AlmaLinux 9.2 ESU , Alpine Linux 3.22 , Debian 10 , Debian 11 , Debian 12 , Debian 13 , EL 10 , EL 7 , EL 8 , EL 9 , TuxCare 9.6 ESU , Ubuntu 18.04 , Ubuntu 20.04 , Ubuntu 22.04 , Ubuntu 24.04
Affected packages:
nodejs @ 14 (+68 more)

A flaw in Node.js 20’s HTTP parser allows improper termination of HTTP/1 headers using \r\n\rX instead of the required \r\n\r\n. 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.

Fixes