CVE-2026-101910 ip-address: no classifier recognizes the NAT64 local-use range 64:ff9b:1::/48, allowing SSRF and trust-boundary bypass
MediumCVSS 6.9
EPSS 0.39%
- Published
- Updated
- Exploit status
- No public exploit known
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.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| beaugunderson ip-address | = >= 10.2.0, < 10.5.1 | No fix listed |
| debian/node-ip-address(Debian:14) | < 10.7.2-1 | 10.7.2-1 |
| debian/node-ip-address(Debian:14) | = 10.2.0-1 | No fix listed |
| debian/node-ip-address(Debian:14) | = 10.2.0-2 | No fix listed |
| debian/node-ip-address(Debian:14) | = 10.3.1-1 | No fix listed |
| debian/node-ip-address(Debian:14) | = 10.4.0-1 | No fix listed |
| debian/node-ip-address(Debian:14) | = 8.1.0-2 | No fix listed |
| debian/node-ip-address(Debian:14) | = 8.1.0-3 | No fix listed |
| npm ip-address(npm) | >= 10.2.0, <= 10.5.0 | No fix listed |
| ubuntu/node-ip-address(Ubuntu:22.04) | All versions | No fix listed |
| ubuntu/node-ip-address(Ubuntu:24.04) | All versions | No fix listed |
| ubuntu/node-ip-address(Ubuntu:26.04) | All versions | No fix listed |
| ubuntu/node-ip-address(Ubuntu:26.10) | All versions | No fix listed |
References
- Red Hat CVE page mitigation vendor-advisory
- Red Hat Bugzilla 2542599 issue-tracking
- www.cve.org
- nvd.nist.gov third-party-advisory
- https://github.com/beaugunderson/ip-address/commit/ab3dc88bcf5374344168a2ba075ca7ac4ff257f8 patch
- https://github.com/beaugunderson/ip-address/releases/tag/v10.5.1
- https://github.com/beaugunderson/ip-address/security/advisories/GHSA-2vr4-cq9g-pvrc exploit vendor-advisory
- Debian Security Tracker CVE-2026-101910 vendor-advisory
- github.com
- Ubuntu CVE tracker vendor-advisory