Security advisory

{
  "id": "d6d44c06e38a73eea4fe88bfab660c15ae5e2691b5212b5c6bab8b7fa3d483ad",
  "url": "https://osv.dev/vulnerability/CVE-2018-3759",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2018-3759",
    "summary": "private_address_check ruby gem before 0.5.0 is vulnerable to a time-of-check time-of-use (TOCTOU) race condition due to the address the socket uses not being checked. DNS entries with a TTL of 0 can trigger this case where the initial resolution is a public address but the subsequent resolution is a private address.",
    "evidence": "osv:CVE-2018-3759",
    "products": [],
    "severity": "low",
    "structured": {
      "id": "CVE-2018-3759",
      "aliases": [
        "CVE-2018-3759",
        "GHSA-2xvj-j3qh-x8c3"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/jtdowney/private_address_check",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0498dcf8e0705c45b1f888e24be59939e5aecbcb"
                },
                {
                  "fixed": "4068228187db87fea7577f7020099399772bb147"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:private_address_check_project:private_address_check:*:*:*:*:*:ruby:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.5.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "4068228187db87fea7577f7020099399772bb147"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.4.1",
            "v0.4.0",
            "v0.3.0",
            "v0.2.0",
            "v0.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-3759.json"
          }
        }
      ],
      "modified": "2026-10-20T10:50:26.702993172Z",
      "provider": "osv",
      "references": [
        "https://github.com/jtdowney/private_address_check/commit/4068228187db87fea7577f7020099399772bb147"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2018-3759",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 381717,
  "published_at": "2018-06-13T15:29:00.267+00:00"
}