CVE-2022-35948 CRLF Injection in Nodejs ‘undici’ via Content-Type
Attackers can inject CRLF sequences into HTTP headers via unsanitized content-type input, causing request splitting in 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-2022-35948?
CVE-2022-35948 is a medium-severity vulnerability in Nodejs Undici, published on 13 Aug 2022. 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, written from scratch for Node.js.`=< [email protected]` users are vulnerable to _CRLF Injection_ on headers when using unsanitized input as request headers, more specifically, inside the `content-type` header. Example: ``` import { request } from 'undici' const unsanitizedContentTypeInput = 'application/json\r\n\r\nGET /foo2 HTTP/1.1' await request('http://localhost:3000, { method: 'GET', headers: { 'content-type': unsanitizedContentTypeInput }, }) ``` The above snippet will perform two requests in a single `request` API call: 1) `http://localhost:3000/` 2) `http://localhost:3000/foo2` This issue was patched in Undici v5.8.1. Sanitize input when sending content-type headers using user input as a workaround.
Which versions are affected by CVE-2022-35948?
2 open source packages ship an affected version, including undici. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
undici npm | All versions | 5.8.2 |
undici npm | All versions | 5.8.2 |
Products include Nodejs Undici.
How do I fix CVE-2022-35948?
Upgrade undici to 5.8.2 or later.
Is CVE-2022-35948 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2022-35948 exists.
Other vulnerabilities in Nodejs Undici
- CVE-2026-109855 undici WebSocket client vulnerable to Denial of Service via failed HTTP/2 handshake
- CVE-2026-109869 undici vulnerable to Denial of Service via unhandled error on excessive content-encodings
- CVE-2026-87018 undici vulnerable to Denial of Service via TLS 1.2 certificate-changing renegotiation
- CVE-2026-19534 undici vulnerable to Denial of Service via unrequested WebSocket subprotocol
- CVE-2026-12151 undici WebSocket client vulnerable to denial of service via fragment count bypass
Sources
Also known as DEBIAN-CVE-2022-35948, GHSA-f772-66g8-q5h3.