{"id":"CVE-2026-101910","title":"ip-address is a library for parsing and manipulating IPv4 and IPv6 addresses in JavaScript","summary":"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. Applicati…","severity":"medium","cvss":6.9,"cvssVector":"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","cwe":["CWE-918","CWE-184"],"vendor":"beaugunderson","product":"ip-address","affected":["ip-address >= 10.2.0, < 10.5.1"],"published":"2026-09-28","updated":"2026-09-28","sourceUpdated":"2026-09-28T19:16:48.560","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-101910","references":[{"url":"https://github.com/beaugunderson/ip-address/commit/ab3dc88bcf5374344168a2ba075ca7ac4ff257f8","label":"security-advisories@github.com"},{"url":"https://github.com/beaugunderson/ip-address/releases/tag/v10.5.1","label":"security-advisories@github.com"},{"url":"https://github.com/beaugunderson/ip-address/security/advisories/GHSA-2vr4-cq9g-pvrc","label":"security-advisories@github.com"},{"url":"https://github.com/beaugunderson/ip-address/security/advisories/GHSA-2vr4-cq9g-pvrc","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-101910"},{"url":"https://github.com/advisories/GHSA-2vr4-cq9g-pvrc"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-101910.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-101910"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2542599"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-101910"}],"tags":["nvd","cve.org","exploit-available","ghsa","npm","csaf","vex","red-hat"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-28T18:12:11.522445Z"},"cvssSource":"cna","ingestedAt":"2026-09-28T18:17:54.308Z","aliases":["GHSA-2vr4-cq9g-pvrc"],"ecosystem":"npm","patched":["ip-address 10.5.1"],"scores":{"cna":6.9,"vendor":5.3},"epss":0.00386,"epssPercentile":0.30073,"slug":"CVE-2026-101910","body":"## Overview\n\nip-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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-101910)\n\nAffected packages:\n\n- `ip-address >= 10.2.0, <= 10.5.0`\n\nPatched in:\n\n- `ip-address 10.5.1`\n\nSource: https://github.com/advisories/GHSA-2vr4-cq9g-pvrc\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Hardened Images · no fix planned: Red Hat Hardened Images · updated 2026-09-28 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-101910.json)","depth":"twilight","depthScore":50,"depthScoreParts":{"impact":38,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":212111,"id":"CVE-2026-101910","ts":1790623195568,"field":"exploit_available","old":"false","new":"true"}]}