CVE-2026-42338: Beaugunderson IP-Address

Medium severity, CVSS 6.1. EPSS: 0.5% chance of exploitation in the next 30 days.

ip-address is a library for parsing and manipulating IPv4 and IPv6 addresses in JavaScript. Prior to 10.1.1, Address6.group() and Address6.link() do not HTML-escape attacker-controlled content before embedding it in the HTML strings they return, and AddressError.parseMessage (emitted by the Address6 constructor for invalid input) can contain unescaped attacker-controlled content in one branch. An application that (1) passes untrusted input to Address6 and (2) renders the output of these methods, or the thrown error's parseMessage, as HTML (e.g. via innerHTML) is vulnerable to cross-site scripting. This vulnerability is fixed in 10.1.1.

Affected products

• Beaugunderson IP-Address: before 10.1.1 (fixed in 10.1.1)

Published 2026-05-12. Last modified 2026-09-11.