CVE-2023-23936

Name: CVE-2023-23936
Creator: NVD / NIST
Published: 2023-02-16T18:15:10.877+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 1.13%

Last modified Jun 17, 2026

CVE-2023-23936 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. 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. EPSS estimates a 1.13% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.4/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

EPSS Probability

1.13%

62.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Nodejs	Node.Js	>= 16.0.0, < 16.19.1
Nodejs	Node.Js	>= 18.0.0, < 18.14.1
Nodejs	Node.Js	>= 19.0.0, < 19.6.1
Nodejs	Undici	>= 2.0.0, < 5.19.1

References

https://github.com/nodejs/undici/commit/a2eff05401358f6595138df963837c24348f2034Patch
https://github.com/nodejs/undici/releases/tag/v5.19.1Release Notes
https://github.com/nodejs/undici/security/advisories/GHSA-5r9g-qh6m-jxffVendor Advisory
https://hackerone.com/reports/1820955Exploit, Third Party Advisory
https://github.com/nodejs/undici/commit/a2eff05401358f6595138df963837c24348f2034Patch
https://github.com/nodejs/undici/releases/tag/v5.19.1Release Notes
https://github.com/nodejs/undici/security/advisories/GHSA-5r9g-qh6m-jxffVendor Advisory
https://hackerone.com/reports/1820955Exploit, Third Party Advisory

Timeline

Published: Feb 16, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-23936?

How severe is CVE-2023-23936?

CVE-2023-23936 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 1.13% probability of exploitation in the next 30 days.

How do I fix CVE-2023-23936?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-23936?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST