CVE-2026-101913

Description

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.

References

• https://github.com/beaugunderson/ip-address/commit/d03e960c7cc3179ef25c8a44b4f94dd499625546
• https://github.com/beaugunderson/ip-address/releases/tag/v10.5.1
• https://github.com/beaugunderson/ip-address/security/advisories/GHSA-rpw4-54j3-4h4q
• https://github.com/beaugunderson/ip-address/security/advisories/GHSA-rpw4-54j3-4h4q