beaugunderson ip-address up to 10.2.1 isInSubnet input validation

Summaryinfo

A vulnerability was found in beaugunderson ip-address up to 10.2.1. It has been declared as critical. This issue affects the function isInSubnet. Such manipulation leads to input validation. This vulnerability is traded as CVE-2026-69198. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in beaugunderson ip-address up to 10.2.1 and classified as critical. Affected by this issue is the function isInSubnet. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-69198 since 08/03/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

Upgrading to version 10.2.2 eliminates this vulnerability.

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Productinfo

Vendor

• beaugunderson

Name

• ip-address

Version

• 10.0
• 10.1
• 10.1.0
• 10.1.1
• 10.1.2
• 10.1.3
• 10.1.4
• 10.1.5
• 10.1.6
• 10.1.7
• 10.1.8
• 10.1.9
• 10.2.0
• 10.2.1

Website

• Product: https://github.com/beaugunderson/ip-address/

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CPE 2.2info

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