{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "source": "REFERENCES"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "f3e0c6899c5b3823dcfd860fc6cb3edbedc9bf65"
            }
          ],
          "repo": "https://github.com/vulnerability-lookup/vulnerability-lookup",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "CIRCL",
    "cwe_ids": [
      "CWE-918"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72761.json"
  },
  "details": "The webhook URL validator in `website/notifications/webhooks.py` uses\n`ip.is_global` to reject non-public addresses after DNS resolution. IPv6\ntransition addresses (NAT64 `64:ff9b::/96`, 6to4 `2002::/16`, Teredo\n`2001:0000::/32`) are classified as globally routable by IANA, so `is_global`\nreturns `True` even when the embedded IPv4 targets a private, loopback, or\ncloud metadata destination. An attacker can register a webhook pointing at a\nhostname that resolves to a transition address to bypass the SSRF guard and\nexfiltrate vulnerability data to an internal endpoint.\n\nThe vulnerability was introduced on a non-release version. The fix was already done on HEAD. It only affects\n\norganisation running the HEAD.",
  "id": "CVE-2026-72761",
  "modified": "2026-08-28T11:30:18.774355912Z",
  "published": "2026-08-10T14:33:13.106Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72761.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72761"
    },
    {
      "type": "FIX",
      "url": "https://github.com/vulnerability-lookup/vulnerability-lookup/commit/f3e0c6899c5b3823dcfd860fc6cb3edbedc9bf65"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/vulnerability-lookup/vulnerability-lookup"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Webhook SSRF guard bypassed by IPv6 transition addresses (NAT64/6to4/Teredo pass is_global check) in vulnerability-lookup"
}