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

Quick assessment

Affected
beaugunderson ip-address
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

是一个用于在 JavaScript 中解析和操作 IPv4 和 IPv6 地址的库。从版本 10.2.0 到 10.5.1， 中的 类的 分类器未能正确识别 NAT64 本地使用范围 。如果应用程序在信任边界决策中同时使用了 、 和 进行判断，那么通过该 NAT64 范围编码的内部 IPv4 目标地址可能会被错误地视为外部地址。 该漏洞的利用依赖于服务器网络中部署了由运营商选择的、属于本地使用范围内的 NAT64 前缀。成功利用此漏洞可能导致绕过预期的网络信任边界。 此问题已在版本 10.5.1 中得到修复。

CVSS 6.9 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
beaugunderson ip-address >= 10.2.0, < 10.5.1 affected
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I. Basic Information for CVE-2026-101910

Vulnerability Information
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Vulnerability Title
ip-address: no classifier recognizes the NAT64 local-use range 64:ff9b:1::/48, allowing SSRF and trust-boundary bypass
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
beaugunderson ip-address >= 10.2.0, < 10.5.1 -

II. Public POCs for CVE-2026-101910

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III. Intelligence Information for CVE-2026-101910

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Other References for CVE-2026-101910 (3)

Same Patch Batch · beaugunderson · 2026-09-28 · 4 CVEs total

CVE-2026-101913 6.3 MEDIUM ip-address: Address6.isLinkLocal() recognizes fe80::/64 rather than fe80::/10, allowing SS
CVE-2026-101911 6.3 MEDIUM ip-address: Address6 builds a parse diagnostic proportional to the input with no length bo
CVE-2026-101912 6.3 MEDIUM ip-address: isInSubnet() and isHostInSubnet() compare addresses of different families as i

IV. Related Vulnerabilities

Same product: ip-address
Same vendor: beaugunderson
Same weakness: CWE-918

V. Comments for CVE-2026-101910

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