CVE-2025-23167 Other in node
Attackers can bypass proxy access controls via HTTP request smuggling in Node.js 20 due to improper header termination.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-23167?
CVE-2025-23167 is a medium-severity vulnerability in nodejs node, published on 19 May 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-444
Which versions are affected by CVE-2025-23167?
2 open source packages ship an affected version, including node and node-min.
| Package | Affected | Fixed in |
|---|---|---|
node Bitnami | All versions | 20.19.2 |
node-min Bitnami | All versions | 20.19.2 |
How do I fix CVE-2025-23167?
Upgrade node to 20.19.2 or later.
Is CVE-2025-23167 being exploited?
There is no known exploitation of CVE-2025-23167 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as AZL-61914, AZL-65063, BELL-CVE-2025-23167, BIT-node-2025-23167, BIT-node-min-2025-23167, DEBIAN-CVE-2025-23167 and 4 more.