CVE-2023-23936 CRLF Injection in Nodejs ‘undici’ via host
Attackers can inject CRLF characters into the host header, potentially causing HTTP request smuggling or response splitting in applications using the undici library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-23936?
CVE-2023-23936 is a medium-severity vulnerability in Nodejs Node.js, published on 16 Feb 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Undici is an HTTP/1.1 client for Node.js. Starting with version 2.0.0 and prior to version 5.19.1, the undici library does not protect `host` HTTP header from CRLF injection vulnerabilities. This issue is patched in Undici v5.19.1. As a workaround, sanitize the `headers.host` string before passing to undici.
Which versions are affected by CVE-2023-23936?
4 open source packages ship an affected version, including undici, node and node-min. It affects 2 products.
| Package | Affected | Fixed in |
|---|---|---|
undici npm | From 2.0.0 | 5.19.1 |
undici npm | From 2.0.0 | 5.19.1 |
node Bitnami | From 16.0.0 | 16.19.1, 18.14.1, 19.6.1 |
node-min Bitnami | From 16.0.0 | 16.19.1, 18.14.1, 19.6.1 |
Products include Nodejs Node.js, Nodejs Undici.
How do I fix CVE-2023-23936?
Upgrade undici to 5.19.1 or later.
Is CVE-2023-23936 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-23936 exists.
Other vulnerabilities in Nodejs Node.js
Sources
Also known as ALPINE-CVE-2023-23936, AZL-13604, BIT-node-2023-23936, BIT-node-min-2023-23936, CLEANSTART-2026-AU79702, CLEANSTART-2026-BN25034 and 2 more.