{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.13.0"
      },
      "package": {
        "ecosystem": "npm",
        "name": "@nevware21/ts-utils"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.14.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-46681"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1321"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-21T21:41:36Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "## Summary\n\nThe _copyProps function in lib/src/object/copy.ts uses for...in to iterate over source object properties without an Object.hasOwnProperty check, and does not filter dangerous keys (__proto__, constructor, prototype). This allows an attacker to pollute the prototype chain of all objects in the application.\n\n## Details\n\nIn _copyProps() (copy.ts lines 186-191), the code iterates all enumerable properties including inherited ones and dangerous keys like __proto__. Any object with a __proto__ key (e.g., from untrusted JSON input) will overwrite the target\u0027s prototype.\n\n## PoC\n```\nconst malicious = JSON.parse(\u0027{\"__proto__\": {\"polluted\": true}}\u0027);\nobjDeepCopy(malicious);\nconsole.log({}.polluted); // true\n```\n## Suggested Fix\n\nAdd objHasOwnProperty check and filter __proto__, constructor, prototype keys.",
  "id": "GHSA-x7j8-49r8-mr43",
  "modified": "2026-05-21T21:41:36Z",
  "published": "2026-05-21T21:41:36Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/nevware21/ts-utils/security/advisories/GHSA-x7j8-49r8-mr43"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/nevware21/ts-utils"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U",
      "type": "CVSS_V4"
    }
  ],
  "summary": "@nevware21/ts-utils: Prototype Pollution in objDeepCopy/objCopyProps via for...in without hasOwnProperty"
}