Medium severity · published Sep 28, 2026
CVE-2026-101910
ip-address: no classifier recognizes the NAT64 local-use range 64:ff9b:1::/48, allowing SSRF and trust-boundary bypass
6.9
CVSS
0.4%
EPSS
No
On KEV
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 32% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
IP
ip-address · beaugunderson
>= 10.2.0, < 10.5.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-101910
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-101910
x_refsource_CONFIRM
https://github.com/beaugunderson/ip-address/security/advisories/GHSA-2vr4-cq9g-pvrc
x_refsource_MISC
https://github.com/beaugunderson/ip-address/commit/ab3dc88bcf5374344168a2ba075ca7ac4ff257f8
x_refsource_MISC
https://github.com/beaugunderson/ip-address/releases/tag/v10.5.1
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