Security advisory

{
  "id": "9314dce9fcc608288068f7018f793ed858d6aa51f6444b0b92e7d33b11e615c7",
  "url": "https://osv.dev/vulnerability/CVE-2021-23386",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-23386",
    "summary": "This affects the package dns-packet before 5.2.2. It creates buffers with allocUnsafe and does not always fill them before forming network packets. This can expose internal application memory over unencrypted network when querying crafted invalid domain names.",
    "evidence": "osv:CVE-2021-23386",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-23386",
      "aliases": [
        "CVE-2021-23386",
        "GHSA-3wcq-x3mq-6r9p"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/mafintosh/dns-packet",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "ebdf849da5dc0d96836e87628349776c623c5be7"
                },
                {
                  "introduced": "a77e1bbcc7cd0acd3cf46fe141df869d2b86f366"
                },
                {
                  "fixed": "bb04450fe4c39b5a2cf0974bb5cf5ef624cbd3da"
                },
                {
                  "fixed": "25f15dd0fedc53688b25fd053ebbdffe3d5c1c56"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:dns-packet_project:dns-packet:*:*:*:*:*:node.js:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.3.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:dns-packet_project:dns-packet:*:*:*:*:*:node.js:*:*",
                    "range": [
                      {
                        "introduced": "2.0.0"
                      },
                      {
                        "fixed": "5.2.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "25f15dd0fedc53688b25fd053ebbdffe3d5c1c56"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.3.3",
            "v1.3.2",
            "v1.3.1",
            "v5.2.1",
            "v5.2.0",
            "v5.1.2",
            "v5.1.1",
            "v5.1.0",
            "v5.0.4",
            "v5.0.3",
            "v5.0.2",
            "v5.0.1",
            "v5.0.0",
            "v4.2.0",
            "v4.1.1",
            "v4.1.0",
            "v4.0.0",
            "v3.0.1",
            "v3.0.0",
            "v2.0.0",
            "v1.3.0",
            "v1.2.2",
            "v1.2.1",
            "v1.2.0",
            "v1.1.1",
            "v1.1.0",
            "v1.0.2",
            "v1.0.1",
            "v1.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-23386.json"
          }
        }
      ],
      "modified": "2026-10-20T10:53:37.691961791Z",
      "provider": "osv",
      "references": [
        "https://hackerone.com/bugs?subject=user&amp%3Breport_id=968858",
        "https://github.com/mafintosh/dns-packet/commit/25f15dd0fedc53688b25fd053ebbdffe3d5c1c56",
        "https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1295719",
        "https://snyk.io/vuln/SNYK-JS-DNSPACKET-1293563"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-23386",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 384447,
  "published_at": "2021-05-20T17:15:07.567+00:00"
}