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CVE-2026-54272 affects ip-address, a JavaScript library for parsing and manipulating IP addresses, in versions 10.1.1 through 10.2.0. Address6.getType() omits IPv4-mapped addresses from its special-use classification table, causing them to default to Global unicast, while NAT64 addresses retain NAT64-specific labels. The isLoopback(), isUnspecified(), and isMulticast() checks consequently return false for affected addresses, and isLinkLocal() and isULA() examine only native IPv6 ranges. These checks do not normalize addresses to their embedded IPv4 representation, despite the available isMapped4() and to4() methods. Applications relying on these checks to restrict request destinations can therefore permit server-side request forgery to otherwise prohibited IPv4 destinations. Version 10.2.1 fixes the issue.
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A vulnerability listed as fixed by the npm/brace-expansion dependency update in Oracle Linux advisory ELSA-2026-74085. The precise affected component and vulnerability mechanism are not distinguished.
An address-classification flaw in the JavaScript ip-address library versions 10.1.1–10.2.0 can bypass address-based SSRF protections. IPv4-mapped and NAT64 IPv6 addresses are not normalized to their embedded IPv4 addresses before classification, causing checks for restricted address types to return incorrect results. IPv4-mapped exploitation is reachable on dual-stack hosts; end-to-end NAT64 reachability additionally requires a NAT64/DNS64 gateway. The reported CVSS v3 base score is 7.2 and CVSS v4 base score is 6.9. Updating to version 10.2.1 or later fixes the issue.
A server-side request forgery vulnerability in ip-address due to misclassification of IPv4-mapped and NAT64 IPv6 addresses.
A vulnerability addressed by the Alma Linux ALSA-2026-54371 Node.js security update.
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Cross-references every affected SKU, including bundled OEM variants.
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