Riskcovery

CVE-2026-101912

ip-address: isInSubnet() and isHostInSubnet() compare addresses of different families as if they shared an address space, allowing an allowlist check to admit an address outside its range

State
Published
Severity
6.3 Medium
Published
Sep 28, 2026
Updated
Sep 28, 2026
Reserved
Sep 28, 2026

Read the record on cve.org

Description

ip-address is a library for parsing and manipulating IPv4 and IPv6 addresses in JavaScript. Prior to 10.7.1, the isInSubnet and isHostInSubnet methods in src/common.ts compare masked binary strings without validating that both operands use the same IP family. A cross-family containment check whose leading address bits match makes the masked strings compare equal even though IPv4 and IPv6 do not share an address space. An allowlist or denylist decision can therefore classify an address outside the intended range as contained. This issue is fixed in version 10.7.1.

Scores

CVSSScoreVectorSource
4.06.3 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:NGitHub_M

Weaknesses

  • CWE-697 Incorrect Comparison
  • CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')

Affected Products

ProductVersions
ip-addressbeaugunderson
  • < 10.7.1Affected

References

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