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CVE-2025-23167

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Date: May 18, 2025

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.

Severity Score

Related Resources (3)

https://nvd.nist.gov/vuln/detail/CVE-2025-23167
https://nodejs.org/en/blog/vulnerability/may-2025-security-releases
https://www.mend.io/vulnerability-database/CVE-2025-23167

Severity Score

Weakness Type (CWE)

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

CWE-444

Top Fix

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Upgrade to version https://github.com/nodejs/node.git - v20.19.2

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): LOW
Integrity (I): LOW
Availability (A): NONE

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