CVE-2023-24807: Node.js Undici

High severity, CVSS 7.5. EPSS: 1.3% chance of exploitation in the next 30 days.

Undici is an HTTP/1.1 client for Node.js. Prior to version 5.19.1, the `Headers.set()` and `Headers.append()` methods are vulnerable to Regular Expression Denial of Service (ReDoS) attacks when untrusted values are passed into the functions. This is due to the inefficient regular expression used to normalize the values in the `headerValueNormalize()` utility function. This vulnerability was patched in v5.19.1. No known workarounds are available.

Affected products

• Node.js Undici: before 5.19.1 (fixed in 5.19.1)

Published 2023-02-16. Last modified 2026-06-17.