ip-address: Address6.isLinkLocal() recognizes fe80::/64 rather than fe80::/10, allowing SSRF and trust-boundary bypass to on-link hosts

{
  "id": "168157ef61b9f1e41adce6f8179082f5388487d652ad5ea0c4b54d572b6d25c5",
  "url": "https://osv.dev/vulnerability/CVE-2026-101913",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ip-address: Address6.isLinkLocal() recognizes fe80::/64 rather than fe80::/10, allowing SSRF and trust-boundary bypass to on-link hosts",
    "summary": "ip-address is a library for parsing and manipulating IPv4 and IPv6 addresses in JavaScript. Prior to 10.5.1, the Address6 isLinkLocal method in src/ipv6.ts recognizes only fe80::/64 instead of the complete fe80::/10 IPv6 link-local range. An attacker-controlled address elsewhere in fe80::/10 can therefore pass a trust-boundary check that relies on isLinkLocal. The same address is identified as link-local by getType and getScope, exposing the inconsistent classification. A successful bypass can reach an on-link host outside the intended trust boundary. This issue is fixed in version 10.5.1.",
    "evidence": "osv:CVE-2026-101913",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-101913",
      "aliases": [
        "CVE-2026-101913",
        "GHSA-rpw4-54j3-4h4q"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/beaugunderson/ip-address",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "38b02d73cfc0724f9ad61c65b6328e116eac03ec"
                },
                {
                  "fixed": "d03e960c7cc3179ef25c8a44b4f94dd499625546"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "10.5.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "d03e960c7cc3179ef25c8a44b4f94dd499625546"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "38b02d73cfc0724f9ad61c65b6328e116eac03ec"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v10.5.1"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v10.5.0",
            "v10.4.0",
            "v10.3.1",
            "v10.3.0",
            "v10.2.2",
            "v10.2.1",
            "v10.2.0",
            "v10.1.1",
            "v10.1.0",
            "v10.0.1",
            "v10.0.0",
            "v9.1.0-0",
            "v9.0.5",
            "v9.0.3",
            "v9.0.2",
            "v9.0.1",
            "v9.0.0",
            "v8.1.0",
            "v8.0.0",
            "v7.1.0",
            "v7.0.1",
            "v7.0.0",
            "v6.4.0",
            "v6.3.0",
            "v6.2.0",
            "v6.1.0",
            "v6.0.0",
            "v5.9.4",
            "v5.9.3",
            "v5.9.2",
            "v5.9.1",
            "v5.9.0",
            "v5.8.9",
            "v5.8.8",
            "v5.8.7",
            "v5.8.6",
            "v5.8.5",
            "v5.8.4",
            "v5.8.3",
            "v5.8.2",
            "v5.8.1",
            "v5.8.0",
            "v5.7.0",
            "v5.6.0",
            "v5.5.0",
            "v5.4.1",
            "v5.4.0",
            "v5.3.0",
            "v5.2.0",
            "v3.1.0",
            "v2.0.2",
            "v2.0.1",
            "2.0.0",
            "1.1.0",
            "1.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-101913.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:45.610733632Z",
      "provider": "osv",
      "references": [
        "https://github.com/beaugunderson/ip-address/releases/tag/v10.5.1",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/101xxx/CVE-2026-101913.json",
        "https://github.com/beaugunderson/ip-address/security/advisories/GHSA-rpw4-54j3-4h4q",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-101913",
        "https://github.com/beaugunderson/ip-address/commit/d03e960c7cc3179ef25c8a44b4f94dd499625546"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-697",
          "CWE-918"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/101xxx/CVE-2026-101913.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-101913",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 513705,
  "published_at": "2026-09-28T17:49:02.657+00:00"
}