{"id":"CVE-2026-101910","summary":"ip-address: no classifier recognizes the NAT64 local-use range 64:ff9b:1::/48, allowing SSRF and trust-boundary bypass","details":"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.","aliases":["GHSA-2vr4-cq9g-pvrc"],"modified":"2026-09-29T03:45:59.625045795Z","published":"2026-09-28T17:45:27.675Z","database_specific":{"cwe_ids":["CWE-918"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/101xxx/CVE-2026-101910.json","cna_assigner":"GitHub_M"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/101xxx/CVE-2026-101910.json"},{"type":"FIX","url":"https://github.com/beaugunderson/ip-address/commit/ab3dc88bcf5374344168a2ba075ca7ac4ff257f8"},{"type":"WEB","url":"https://github.com/beaugunderson/ip-address/releases/tag/v10.5.1"},{"type":"ADVISORY","url":"https://github.com/beaugunderson/ip-address/security/advisories/GHSA-2vr4-cq9g-pvrc"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-101910"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/beaugunderson/ip-address","events":[{"introduced":"80fccaae984618f35dc941efab55cf2440ab37e8"},{"fixed":"38b02d73cfc0724f9ad61c65b6328e116eac03ec"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"10.2.0"},{"fixed":"10.5.1"}]}}],"versions":["v10.5.0","v10.4.0","v10.3.1","v10.3.0","v10.2.2","v10.2.1","v10.2.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-101910.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}