# CVE-2022-35949: node-undici: undici is an HTTP/1.1 client, written from scratch for Node.js.`undici` is vulnerable to SSRF (Server-side Request Fo...

CVE-2022-35949 is fixed in node-undici on 1 platform, first by DEBIAN-CVE-2022-35949, released August 12, 2022. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2022-35949
- Priority: Urgent
- CVSS: 9.8 (critical)
- EPSS: 0.0193
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 12, 2022

## Description

undici is an HTTP/1.1 client, written from scratch for Node.js.`undici` is vulnerable to SSRF (Server-side Request Forgery) when an application takes in **user input** into the `path/pathname` option of `undici.request`. If a user specifies a URL such as `http://127.0.0.1` or `//127.0.0.1` ```js const undici = require("undici") undici.request({origin: "http://example.com", pathname: "//127.0.0.1"}) ``` Instead of processing the request as `http://example.org//127.0.0.1` (or `http://example.org/http://127.0.0.1` when `http://127.0.0.1 is used`), it actually processes the request as `http://127.0.0.1/` and sends it to `http://127.0.0.1`. If a developer passes in user input into `path` parameter of `undici.request`, it can result in an _SSRF_ as they will assume that the hostname cannot change, when in actual fact it can change because the specified path parameter is combined with the base URL. This issue was fixed in `undici@5.8.1`. The best workaround is to validate user input before passing it to the `undici.request` call.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | node-undici Debian 12.15 (bookworm) | 5.8.2+dfsg1+~cs18.9.18.1-1 | [DEBIAN-CVE-2022-35949](https://patchblox.com/security/data/fix/linux/debian-cve-2022-35949.md) | Aug 12, 2022 |
| Linux | node-undici Debian 13.5 (trixie) | 5.8.2+dfsg1+~cs18.9.18.1-1 | [DEBIAN-CVE-2022-35949](https://patchblox.com/security/data/fix/linux/debian-cve-2022-35949.md) | Aug 12, 2022 |
| Linux | node-undici Debian 14 | 5.8.2+dfsg1+~cs18.9.18.1-1 | [DEBIAN-CVE-2022-35949](https://patchblox.com/security/data/fix/linux/debian-cve-2022-35949.md) | Aug 12, 2022 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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