`undici.request` vulnerable to SSRF using absolute URL on `pathname`
Impact
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
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.
Patches
This issue was fixed in undici@5.8.1.
Workarounds
The best workaround is to validate user input before passing it to the undici.request call.
For more information
If you have any questions or comments about this advisory:
- Open an issue in undici repository
- To make a report, follow the SECURITY document
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | undici | < 5.8.2 | 5.8.2 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N- Weakness (CWE)
CWE-918- Platform
- npm
- Package
undici- Disclosed
- 18.08.2022
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-8qr4-xgw6-wmr3 - CC BY 4.0
Vulnerability history: undici
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 46
- First → latest
- 06.2022 09.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 13
- Medium 21
- Low 12
Disclosures per year
- 2022: 5
- 2023: 3
- 2024: 5
- 2025: 2
- 2026: 31
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`undici.request` vulnerable to SSRF using absolute URL on `pathname` this entry
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