{"id":"GHSA-2vr4-cq9g-pvrc","revision":null,"records":[{"revision":"b4d56285682843e989b39ff5fe477993","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-101910","aliases":[],"title":"ip-address: no classifier recognizes the NAT64 local-use range 64:ff9b:1::/48, allowing SSRF and trust-boundary bypass","description":"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.","state":0,"publishedAt":"2026-09-28T17:45:27.675+00:00","modifiedAt":"2026-09-28T18:12:34.05+00:00","affected":[{"ecosystem":"Vendor product","name":"ip-address","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"beaugunderson\",\n                    \"product\": \"ip-address\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 10.2.0, < 10.5.1\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"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","score":6.9,"severity":"MEDIUM"}],"references":["https://github.com/beaugunderson/ip-address/security/advisories/GHSA-2vr4-cq9g-pvrc","https://github.com/beaugunderson/ip-address/commit/ab3dc88bcf5374344168a2ba075ca7ac4ff257f8","https://github.com/beaugunderson/ip-address/releases/tag/v10.5.1"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-101910","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-101910","identifiers":["CVE-2026-101910"]},"retained":false,"historicalAffected":[]},{"revision":"bd74742c4e4e470b9ae227b7b655e01b","observedAt":"2026-11-11T05:28:21.8+00:00","statement":{"source":"euvd","id":"EUVD-2026-88394","aliases":["CVE-2026-101910","GHSA-2vr4-cq9g-pvrc"],"title":"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…","description":"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.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 4.0","vector":"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","score":6.9,"severity":null}],"references":["https://github.com/beaugunderson/ip-address/security/advisories/GHSA-2vr4-cq9g-pvrc","https://github.com/beaugunderson/ip-address/commit/ab3dc88bcf5374344168a2ba075ca7ac4ff257f8","https://github.com/beaugunderson/ip-address/releases/tag/v10.5.1"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-88394","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Sep 28, 2026, 5:45:27 PM","dateUpdated":"Sep 28, 2026, 6:12:34 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-88394","identifiers":["EUVD-2026-88394","CVE-2026-101910","GHSA-2vr4-cq9g-pvrc"]},"retained":false,"historicalAffected":[]},{"revision":"e5dbbaaef4c44a8db9a246fa22374363","observedAt":"2026-10-25T04:17:26.915+00:00","statement":{"source":"nvd","id":"CVE-2026-101910","aliases":[],"title":"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…","description":"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.","state":0,"publishedAt":"2026-09-28T18:17:20.71+00:00","modifiedAt":"2026-09-30T19:57:08.043+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · security-advisories@github.com · Secondary","vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","score":6.9,"severity":"MEDIUM"}],"references":["https://github.com/beaugunderson/ip-address/commit/ab3dc88bcf5374344168a2ba075ca7ac4ff257f8","https://github.com/beaugunderson/ip-address/releases/tag/v10.5.1","https://github.com/beaugunderson/ip-address/security/advisories/GHSA-2vr4-cq9g-pvrc"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-101910","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-918"],"productCriteria":[],"sourceDates":{"published":"2026-09-28T18:17:20.710","lastModified":"2026-09-30T19:57:08.043"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-101910","identifiers":["CVE-2026-101910"]},"retained":false,"historicalAffected":[]},{"revision":"d8fa5abae8804e3a8c5dd29af37536fd","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-2vr4-cq9g-pvrc","aliases":["CVE-2026-101910"],"title":"ip-address: no classifier recognizes the NAT64 local-use range 64:ff9b:1::/48, allowing SSRF and trust-boundary bypass","description":"### Summary\n\nNo classifier on `Address6` recognizes the NAT64 local-use range `64:ff9b:1::/48` (RFC 8215). `isPrivate()`, `isLoopback()`, `isLinkLocal()` and their siblings all return `false` for every address in it, so an internal IPv4 destination written through a local-use NAT64 prefix (`64:ff9b:1:7f00:0:100::` for `127.0.0.1`, `64:ff9b:1:a9fe:a9:fe00::` for `169.254.169.254`) reads as an ordinary global address. `getType()` names the range `'NAT64 (local-use)'`, so the library knows what the address is and classifies it as nothing.\n\nAn application that builds a network trust-boundary decision on these checks (for example a filter intended to block Server-Side Request Forgery, or SSRF) will classify an internal target as external and allow the request. SSRF is an attack in which a user-supplied address coaxes the server into making a request to an internal destination the user could not otherwise reach, such as a loopback service or a cloud metadata endpoint.\n\n### Details\n\nThe fix for GHSA-22jq-vg5j-6vgg (10.2.1) classifies IPv4-mapped (`::ffff:0:0/96`) and NAT64 well-known (`64:ff9b::/96`) addresses by their embedded IPv4 address: `embeddedIPv4()` in `src/ipv6.ts` decodes the trailing 32 bits and every special-use classifier delegates to the resulting `Address4`. Those are the only two ranges `embeddedIPv4()` handles.\n\nThe local-use range differs in kind from the well-known prefix, which is why extending the decoder does not fix it. RFC 8215 reserves `64:ff9b:1::/48` so an operator can carve their own NAT64 prefix out of it, of any length RFC 6052 allows (`/48`, `/56`, `/64`, or `/96`). Where the IPv4 address sits depends on that choice: `127.0.0.1` is `64:ff9b:1:7f00:0:100::` under a `/48` prefix and `64:ff9b:1::7f00:1` under a `/96` prefix, and each of those decodes to a different address under the other prefix length. There is no single embedded IPv4 address for the library to classify by.\n\nWhat is well-defined is the range as a whole. The IANA IPv6 Special-Purpose Address Registry lists `64:ff9b:1::/48` as not globally reachable, and Python's `ipaddress` module reports `is_private` as `True` and `is_global` as `False` for every address in it. `isPrivate()` covered ULA (`fc00::/7`) plus the decoded mapped and well-known cases, and nothing in the local-use range.\n\n### Affected versions\n\n`>= 10.2.0, <= 10.5.0`. The `is*` classification API was extended to `Address6` in 10.2.0; releases before it do not expose the method and are not affected through this vector.\n\n### Impact\n\nEvery address in `64:ff9b:1::/48` parses successfully, `isValid()` is `true`, and no classifier catches it. Which internal target is reached depends on the NAT64 prefix deployed on the server's network; the well-known prefix column is the patched control from GHSA-22jq-vg5j-6vgg.\n\n| Internal target | Well-known form | Classified | Local-use form (`/48` prefix) | Classified |\n|---|---|---|---|---|\n| `127.0.0.1` | `64:ff9b::7f00:1` | loopback | `64:ff9b:1:7f00:0:100::` | nothing |\n| `10.0.0.1` | `64:ff9b::a00:1` | private | `64:ff9b:1:a00:0:100::` | nothing |\n| `169.254.169.254` | `64:ff9b::a9fe:a9fe` | link-local | `64:ff9b:1:a9fe:a9:fe00::` | nothing |\n| `192.168.1.1` | `64:ff9b::c0a8:101` | private | `64:ff9b:1:c0a8:1:100::` | nothing |\n\n### Reachability\n\nReaching an internal host through one of these addresses requires that the server's network run a NAT64 translator on a prefix inside `64:ff9b:1::/48` and that the attacker guess or know the prefix length. That is the same precondition the well-known prefix carries (a translator on `64:ff9b::/96`), with the additional constraint that the prefix is operator-chosen rather than fixed. The severity reflects that precondition.\n\n### Proof of concept\n\n`npm i ip-address@10.5.0`, then:\n\n```js\nconst { Address6 } = require('ip-address');\n\n// A guard of the shape the library documents.\nfunction isBlocked(host) {\n  const a = new Address6(host);\n  return a.isLoopback() || a.isLinkLocal() || a.isPrivate() || a.isMulticast() || a.isUnspecified();\n}\n\nfor (const h of ['64:ff9b::7f00:1', '64:ff9b:1:7f00:0:100::', '64:ff9b:1::7f00:1']) {\n  console.log(isBlocked(h) ? 'BLOCK' : 'ALLOW', h, '-> getType()', new Address6(h).getType());\n}\n```\n\nOn affected versions:\n\n```\nBLOCK 64:ff9b::7f00:1 -> getType() NAT64 (well-known)\nALLOW 64:ff9b:1:7f00:0:100:: -> getType() NAT64 (local-use)\nALLOW 64:ff9b:1::7f00:1 -> getType() NAT64 (local-use)\n```\n\n### Remediation\n\nUpgrade to the patched release. In the fix, `isPrivate()` returns `true` for every address in `64:ff9b:1::/48`, alongside ULA and the decoded mapped and well-known cases. The range is reported private as a whole rather than by a decoded IPv4 address, for the reason given above; `toAddress4Nat64(prefix)` remains the way to decode an address under a known deployment prefix. `isLoopback()` and `isLinkLocal()` are unchanged for this range, since without the prefix length the library cannot know which IPv4 address is embedded.\n\nIf you cannot upgrade immediately, test the range directly:\n\n```js\nconst NAT64_LOCAL_USE = new Address6('64:ff9b:1::/48');\nconst localUse = new Address6(host).isHostInSubnet(NAT64_LOCAL_USE);\n```\n\n### A note on SSRF defense\n\nThese methods are address classifiers, not a complete SSRF defense. Regardless of this fix, a robust SSRF guard must resolve the hostname and validate the *resolved* IP against the socket it connects to, and account for DNS rebinding and redirects. Treat these checks as one layer, not the only one.","state":0,"publishedAt":"2026-09-28T20:43:03+00:00","modifiedAt":"2026-09-28T21:00:05.3556821+00:00","affected":[{"ecosystem":"npm","name":"ip-address","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"10.2.0"},{"kind":"fixed","version":"10.5.1"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"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","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/beaugunderson/ip-address/security/advisories/GHSA-2vr4-cq9g-pvrc","https://nvd.nist.gov/vuln/detail/CVE-2026-101910","https://github.com/beaugunderson/ip-address/commit/ab3dc88bcf5374344168a2ba075ca7ac4ff257f8","https://github.com/beaugunderson/ip-address","https://github.com/beaugunderson/ip-address/releases/tag/v10.5.1"],"sourceUrl":"https://github.com/advisories/GHSA-2vr4-cq9g-pvrc","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-2vr4-cq9g-pvrc","identifiers":["GHSA-2vr4-cq9g-pvrc","CVE-2026-101910"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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