Security advisory

{
  "id": "c3393195697d09933415b570c112698bda4fe82a4d43ea6d10ae85fb43f9083d",
  "url": "https://osv.dev/vulnerability/CVE-2021-23568",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-23568",
    "summary": "The package extend2 before 1.0.1 are vulnerable to Prototype Pollution via the extend function due to unsafe recursive merge.",
    "evidence": "osv:CVE-2021-23568",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2021-23568",
      "aliases": [
        "CVE-2021-23568",
        "GHSA-gjm5-83cw-p3p2",
        "SNYK-JS-EXTEND2-2320315"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/eggjs/extend2",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "28b347dc661790a6d8d8050c2b59f5586bf3ae63"
                },
                {
                  "fixed": "aa332a59116c8398976434b57ea477c6823054f8"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:eggjs:extend2:*:*:*:*:*:node.js:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.0.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "aa332a59116c8398976434b57ea477c6823054f8"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.0.0",
            "v3.0.0",
            "v2.0.1",
            "v2.0.0",
            "v1.3.0",
            "v1.2.1",
            "v1.2.0",
            "v1.1.3",
            "v1.1.2",
            "v1.1.1",
            "v1.1.0",
            "v1.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-23568.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:32.760980704Z",
      "provider": "osv",
      "references": [
        "https://github.com/eggjs/extend2/blob/master/index.js%23L50-L60",
        "https://github.com/eggjs/extend2/commit/aa332a59116c8398976434b57ea477c6823054f8",
        "https://github.com/eggjs/extend2/pull/2",
        "https://snyk.io/vuln/SNYK-JS-EXTEND2-2320315"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-23568",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 385546,
  "published_at": "2022-01-10T14:10:17.043+00:00"
}