ip-address: no classifier recognizes the NAT64 local-use range 64:ff9b:1::/48, allowing SSRF and trust-boundary bypass

Summary No classifier on Address6 recognizes the NAT64 local-use range 64:ff9b:1::/48 RFC 8215. isPrivate, isLoopback, isLinkLocal and their siblings all return false for every address in it, so an internal IPv4 destination written through a local-use NAT64 prefix 64:ff9b:1:7f00:0:100:: for...

CVE-2026-101910

The ip-address JavaScript library (versions 10.2.0 through 10.5.1 ) contains a logic flaw in the Address6 isPrivate classifier located in src/ipv6.ts. Specifically, it fails to recognize the NAT64 local-use range 64:ff9b:1::/48. This allows applications that rely on isPrivate, isLoopback, and isL...

CVE-2026-101910 ip-address: no classifier recognizes the NAT64 local-use range 64:ff9b:1::/48, allowing SSRF and trust-boundary bypass

ip-address is a library for parsing and manipulating IPv4 and IPv6 addresses in JavaScript. From 10.2.0 until 10.5.1, the Address6 isPrivate classifier in src/ipv6.ts does not recognize the NAT64 local-use range 64:ff9b:1::/48. Applications that combine isPrivate, isLoopback, and isLinkLocal for ...

EUVD-2026-88394

ip-address is a library for parsing and manipulating IPv4 and IPv6 addresses in JavaScript. From 10.2.0 until 10.5.1, the Address6 isPrivate classifier in src/ipv6.ts does not recognize the NAT64 local-use range 64:ff9b:1::/48. Applications that combine isPrivate, isLoopback, and isLinkLocal for ...