CVE-2026-42338: ip-address is a library for parsing and manipulating IPv4 and IPv6 addresses in JavaScript

Routine

MEDIUM 6.1UPGRADE

CVE-2026-42338 is a medium-severity flaw (CVSS 6.1) affecting ip-address. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 Add

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.5% (top 60%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-05-12
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: beaugunderson

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-12 20:16 UTCPublished CVE record published
2026-10-26 18:10 UTCUpdated Record last modified

beaugunderson ip-address UPGRADE

Affected: < 10.1.1

Fixed in: 10.1.1

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls ip-address

2. UPGRADE to 10.1.1

npm install ip-address@">=10.1.1"

Advisories and coverage

Official advisories

AlmaLinux Errata: [ALSA-2026:35891] Important: nodejs:24 security, bug fix, and enhancement update 2026-07-07
AlmaLinux Errata: [ALSA-2026:35892] Important: nodejs:22 security, bug fix, and enhancement update 2026-07-07

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-42338?

ip-address: upgrade to 10.1.1. Exact commands for each OS are on this page.

Is CVE-2026-42338 being exploited?

CVE-2026-42338 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-42338 affect?

CVE-2026-42338 affects ip-address. Severity is medium (CVSS 6.1). 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 re

How urgent is CVE-2026-42338?

Priority 36/100. Public exploit reference

References

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