CVE-2026-101910
Description
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 a trust-boundary decision can treat an internal IPv4 destination encoded through that range as external. Exploitation depends on a server network using an operator-selected NAT64 prefix within the local-use range. A successful bypass can cross the intended network trust boundary. This issue is fixed in version 10.5.1.
How to fix
- ip-address10.5.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| ip-addressnpm | 10.2.0 ≤ v < 10.5.1 | 10.5.1 |
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