{
  "affected": [
    {
      "database_specific": {
        "cwes": [
          {
            "cweId": "CWE-506",
            "description": "The product contains code that appears to be malicious in nature.",
            "name": "Embedded Malicious Code"
          },
          {
            "cweId": "CWE-506",
            "description": "The product contains code that appears to be malicious in nature.",
            "name": "Embedded Malicious Code"
          }
        ],
        "indicators": {
          "domains": [
            "www.jsonkeeper.com",
            "34.4.16.104.in-addr.arpa",
            "ip-api.com"
          ],
          "evidence_files": [
            {
              "path": "sign.js",
              "sha256": "e135d3304dec791ebc5bbe8de68881b5e0e287d0bb7b283ada42c0e2aaaba3b5",
              "tlsh": "af227244a4f2922288a320f2f44fe507b539e697356c6ed176cc4394cf898e4e6f7a94"
            },
            {
              "path": "package.json",
              "sha256": "bde0631a9b7e3e43398e1769f303c82c0d5742b6c33949c9fe19b0e114e987ac",
              "tlsh": "8a216801ce18ce6311d9a2e66e2d0583592188439d84fc0d33ea578c0f5c63f39bea6c"
            }
          ],
          "package_integrity": [
            {
              "filename": "jsontoken-extend-1.0.12.tgz",
              "hashes": {
                "sha1": "a4e44ac13141db7ab9df422b01dcb09227aea2ca",
                "sha512_sri": "sha512-FzEAwh5mAu3FoJ8/MsywR7aJMX29wpcvywcm1YjoOQN202mOp3zzsFjkTn4LMSAyHOJ3Np4pn9NC9rttUu4ZlA=="
              }
            }
          ]
        }
      },
      "package": {
        "ecosystem": "npm",
        "name": "jsontoken-extend"
      },
      "versions": [
        "1.0.12",
        "1.0.11"
      ]
    }
  ],
  "credits": [
    {
      "contact": [
        "actran@amazon.com"
      ],
      "name": "Amazon Inspector",
      "type": "FINDER"
    }
  ],
  "database_specific": {
    "malicious-packages-origins": [
      {
        "id": "IN-MAL-2026-004715",
        "import_time": "2026-05-26T05:53:08.670729079Z",
        "modified_time": "2026-05-25T15:58:04Z",
        "sha256": "166f0f03fe28af87dca30356e92bd090fdf203f729aa761976487a818212e830",
        "source": "amazon-inspector",
        "versions": [
          "1.0.12"
        ]
      },
      {
        "id": "IN-MAL-2026-004716",
        "import_time": "2026-05-26T05:53:08.789544431Z",
        "modified_time": "2026-05-25T15:58:18Z",
        "sha256": "8907906fb6b1164ec1dc6d4ddf86f76c0ddbe872cae57a5655b72450b08049dc",
        "source": "amazon-inspector",
        "versions": [
          "1.0.12"
        ]
      },
      {
        "id": "IN-MAL-2026-004700",
        "import_time": "2026-05-26T05:53:06.819413501Z",
        "modified_time": "2026-05-25T15:26:12Z",
        "sha256": "a6ee9c49ff4f24ff70f0f61fd7de9e1a73b10b57f3bbafe4fda47cb01cf92ebf",
        "source": "amazon-inspector",
        "versions": [
          "1.0.11"
        ]
      },
      {
        "id": "IN-MAL-2026-004699",
        "import_time": "2026-05-26T05:53:06.681293593Z",
        "modified_time": "2026-05-25T15:26:07Z",
        "sha256": "59a8a8ab722d33bdd2ea25422aaf7e607a1b1a881446c3561ec8225fb9187742",
        "source": "amazon-inspector",
        "versions": [
          "1.0.11"
        ]
      }
    ]
  },
  "details": "\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (59a8a8ab722d33bdd2ea25422aaf7e607a1b1a881446c3561ec8225fb9187742)\nOn require()/import of jsontoken-extend, sign.js executes a top-level IIFE that base64-decodes a hardcoded string to https://www.jsonkeeper.com/b/XAMRK, fetches the JSON body, and passes data.content directly to eval(). jsonkeeper.com is an anonymous, mutable paste service \u2014 the author can change the executed payload at any time without republishing the package, giving arbitrary remote code execution on every consumer at import time. A second base64-encoded URL (https://www.jsonkeeper.com/b/W80UP) is staged but commented out, indicating multiple prepared payloads. The package name and public API (sign/verify/decode plus JsonWebTokenError/NotBeforeError/TokenExpiredError) mirror the popular jsonwebtoken library exactly, and it even declares jsonwebtoken as a dependency to pass through legitimate-looking calls \u2014 a typosquat lure to attract developers searching for the real JWT library. Base64-wrapping the C2 URLs is a deliberate static-analysis evasion. Three independent block signals are present: import-time fetch+eval from an anonymous mutable host, typosquat naming/API mirroring with malicious payload, and obfuscated C2 URL constants.\n",
  "id": "MAL-2026-4592",
  "modified": "2026-05-26T05:55:03Z",
  "published": "2026-05-25T15:26:07Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://www.npmjs.com/package/jsontoken-extend/v/1.0.12"
    },
    {
      "type": "PACKAGE",
      "url": "https://www.npmjs.com/package/jsontoken-extend/v/1.0.11"
    }
  ],
  "schema_version": "1.7.4",
  "summary": "Malicious code in jsontoken-extend (npm)"
}