MAL-2026-17176
Vulnerability from ossf_malicious_packages
Published
2026-09-25 02:40
Modified
2026-09-25 02:47
Summary
Malicious code in n8n-nodes-moonlet-helpers (npm)
Details

-= Per source details. Do not edit below this line.=-

Source: amazon-inspector (937f80200481fb9bef57f6dc72e7ad55bee68982b1cb7a86b909c86c46e8b2ec)

Package presents itself as n8n helper nodes but ships an empty stub index.js (module.exports = {}) and no functional node modules. On npm install, postinstall.js runs automatically: it performs an HTTPS GET to https://mkicom.com/.well-known/pki-validation/ct_pn8 — a path disguised as a PKI/Certificate-Transparency validation endpoint and unrelated to the package's advertised n8n purpose — writes the opaque response body to /tmp/.np, chmods it 0755, and executes it via spawn('/bin/sh', ['-c', 'setsid /tmp/.np... &'], {detached: true}) so the process survives npm exit. There is no hash, signature, or version pinning on the downloaded bytes. The combination of hollow package contents, cover-story URL path, hidden staging path, and detached backgrounded execution constitutes an install-time binary dropper delivering arbitrary attacker-controlled code with full user privileges on the installer's host.

CWE
  • CWE-506 - The product contains code that appears to be malicious in nature.
  • CWE-506 - The product contains code that appears to be malicious in nature.
Credits
Amazon Inspector inspector-research@amazon.com
To clipboard 

{
  "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": {
          "evidence_files": [
            {
              "path": "postinstall.js",
              "sha256": "57ca4cffba58dc9cb3dbf77dfbd201fd9183cfb5cfb738c4f61ab74b2829eb4a",
              "tlsh": "c10120e751f180106b3240dce063b53fa507f00166429de0f85c85234fc16bd493b5f8"
            }
          ],
          "package_integrity": [
            {
              "filename": "n8n-nodes-moonlet-helpers-1.0.0.tgz",
              "hashes": {
                "sha1": "a021317979bd87040aaa6a70b65255de3a9bbf0c",
                "sha512_sri": "sha512-X7dccg2qEkYT5YeFcaYxLL9gNiaeh7lFwJYhm3YXSBWWxNX0f9Oy9fLk9bOLrCcyQmUnFxW5ZfP9rYQgfDTzVA=="
              }
            }
          ]
        }
      },
      "package": {
        "ecosystem": "npm",
        "name": "n8n-nodes-moonlet-helpers"
      },
      "versions": [
        "1.0.0",
        "1.0.4"
      ]
    }
  ],
  "credits": [
    {
      "contact": [
        "inspector-research@amazon.com"
      ],
      "name": "Amazon Inspector",
      "type": "FINDER"
    }
  ],
  "database_specific": {
    "malicious-packages-origins": [
      {
        "id": "IN-MAL-2026-020541",
        "import_time": "2026-09-25T02:45:28.833479647Z",
        "modified_time": "2026-09-25T02:40:24Z",
        "sha256": "937f80200481fb9bef57f6dc72e7ad55bee68982b1cb7a86b909c86c46e8b2ec",
        "source": "amazon-inspector",
        "versions": [
          "1.0.0"
        ]
      },
      {
        "id": "IN-MAL-2026-020542",
        "import_time": "2026-09-25T02:45:28.862114203Z",
        "modified_time": "2026-09-25T02:40:31Z",
        "sha256": "fe3c30c7100c080a1f0c265a5c4f51f93b5c970eda7531a5f7d91c1114bae554",
        "source": "amazon-inspector",
        "versions": [
          "1.0.4"
        ]
      }
    ]
  },
  "details": "\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (937f80200481fb9bef57f6dc72e7ad55bee68982b1cb7a86b909c86c46e8b2ec)\nPackage presents itself as n8n helper nodes but ships an empty stub `index.js` (`module.exports = {}`) and no functional node modules. On `npm install`, `postinstall.js` runs automatically: it performs an HTTPS GET to `https://mkicom.com/.well-known/pki-validation/ct_pn8` \u2014 a path disguised as a PKI/Certificate-Transparency validation endpoint and unrelated to the package\u0027s advertised n8n purpose \u2014 writes the opaque response body to `/tmp/.np`, chmods it 0755, and executes it via `spawn(\u0027/bin/sh\u0027, [\u0027-c\u0027, \u0027setsid /tmp/.np... \u0026\u0027], {detached: true})` so the process survives npm exit. There is no hash, signature, or version pinning on the downloaded bytes. The combination of hollow package contents, cover-story URL path, hidden staging path, and detached backgrounded execution constitutes an install-time binary dropper delivering arbitrary attacker-controlled code with full user privileges on the installer\u0027s host.\n",
  "id": "MAL-2026-17176",
  "modified": "2026-09-25T02:47:18Z",
  "published": "2026-09-25T02:40:24Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://www.npmjs.com/package/n8n-nodes-moonlet-helpers/v/1.0.0"
    },
    {
      "type": "PACKAGE",
      "url": "https://www.npmjs.com/package/n8n-nodes-moonlet-helpers/v/1.0.4"
    }
  ],
  "schema_version": "1.7.4",
  "summary": "Malicious code in n8n-nodes-moonlet-helpers (npm)"
}



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