---
id: CVE-2026-101913
title: >-
  ip-address is a library for parsing and manipulating IPv4 and IPv6 addresses
  in JavaScript
summary: >-
  ip-address is a library for parsing and manipulating IPv4 and IPv6 addresses
  in JavaScript. Prior to 10.5.1, the Address6 isLinkLocal method in src/ipv6.ts
  recognizes only fe80::/64 instead of the complete fe80::/10 IPv6 link-local
  range…
severity: medium
cvss: 6.3
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N'
cwe:
  - CWE-697
  - CWE-918
vendor: beaugunderson
product: ip-address
affected:
  - ip-address < 10.5.1
published: '2026-09-28'
updated: '2026-09-28'
sourceUpdated: '2026-09-28T19:16:48.690'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-101913'
references:
  - url: >-
      https://github.com/beaugunderson/ip-address/commit/d03e960c7cc3179ef25c8a44b4f94dd499625546
    label: security-advisories@github.com
  - url: 'https://github.com/beaugunderson/ip-address/releases/tag/v10.5.1'
    label: security-advisories@github.com
  - url: >-
      https://github.com/beaugunderson/ip-address/security/advisories/GHSA-rpw4-54j3-4h4q
    label: security-advisories@github.com
  - url: >-
      https://github.com/beaugunderson/ip-address/security/advisories/GHSA-rpw4-54j3-4h4q
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-28T18:37:28.332844Z'
cvssSource: cna
ingestedAt: '2026-09-28T18:17:54.309Z'
---

## Overview

ip-address is a library for parsing and manipulating IPv4 and IPv6 addresses in JavaScript. Prior to 10.5.1, the Address6 isLinkLocal method in src/ipv6.ts recognizes only fe80::/64 instead of the complete fe80::/10 IPv6 link-local range. An attacker-controlled address elsewhere in fe80::/10 can therefore pass a trust-boundary check that relies on isLinkLocal. The same address is identified as link-local by getType and getScope, exposing the inconsistent classification. A successful bypass can reach an on-link host outside the intended trust boundary. This issue is fixed in version 10.5.1.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.