Vulnerability Description
ip-address is a library for parsing and manipulating IPv4 and IPv6 addresses in JavaScript. From 10.1.1 until 10.2.2, every special-use classification method is built on isInSubnet, which short-circuits to false whenever the address's own subnet mask is shorter than the reference range's mask. That mask comes verbatim from the CIDR suffix on the parsed input, so appending a suffix such as /0 suppresses classification entirely: isLoopback(), isPrivate(), isLinkLocal(), isCGNAT(), isMulticast(), isUnspecified(), isBroadcast(), isULA(), and getType() all report an internal address as unremarkable, while correctForm() and address still return the real internal target. An application that builds a network trust-boundary decision on these checks, for example a filter intended to block Server-Side Request Forgery, or SSRF, may therefore treat an internal target as external and allow the request. The underlying bit comparison is correct, and mask(n) already returns the first n bits of the full parsed address independently of subnetMask; the defect is solely that the containment guard sits in the classification path. This issue is fixed in version 10.2.2.
Related Weaknesses (CWE)
References
- https://github.com/beaugunderson/ip-address/commit/488fe9bc7c35363b4b090494fc38c
- https://github.com/beaugunderson/ip-address/releases/tag/v10.2.2
- https://github.com/beaugunderson/ip-address/security/advisories/GHSA-4xrf-jv44-h
- https://github.com/beaugunderson/ip-address/security/advisories/GHSA-4xrf-jv44-h
FAQ
What is CVE-2026-69198?
CVE-2026-69198 is a documented vulnerability. ip-address is a library for parsing and manipulating IPv4 and IPv6 addresses in JavaScript. From 10.1.1 until 10.2.2, every special-use classification method is built on isInSubnet, which short-circui...
How severe is CVE-2026-69198?
CVSS scoring is not yet available for CVE-2026-69198. Check NVD for updates.
Is there a patch for CVE-2026-69198?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.