Security advisory

{
  "id": "e322cb710566e70ac96d95070da34a17be2d1cedae23d503f047921757c626c4",
  "url": "https://osv.dev/vulnerability/CVE-2021-26505",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-26505",
    "summary": "Prototype pollution vulnerability in MrSwitch hello.js version 1.18.6, allows remote attackers to execute arbitrary code via hello.utils.extend function.",
    "evidence": "osv:CVE-2021-26505",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2021-26505",
      "aliases": [
        "CVE-2021-26505",
        "GHSA-g3vf-47fv-8f3c"
      ],
      "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/mrswitch/hello.js",
              "type": "GIT",
              "events": [
                {
                  "introduced": "3d694a97252b28dd09b39a2fd2b7dd3af1fdad63"
                },
                {
                  "last_affected": "3d694a97252b28dd09b39a2fd2b7dd3af1fdad63"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:hello.js_project:hello.js:1.18.6:*:*:*:*:node.js:*:*",
                    "range": [
                      {
                        "introduced": "1.18.6"
                      },
                      {
                        "last_affected": "1.18.6"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.18.6",
            "v1.18.6"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-26505.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:34.243253604Z",
      "provider": "osv",
      "references": [
        "https://github.com/MrSwitch/hello.js/issues/634"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-26505",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 385612,
  "published_at": "2023-08-11T14:15:12.257+00:00"
}