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Malicious code in poly-custom-api (npm)

Type: advisorySource: OSV1 source record

--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (a3263a9e2a986068fafa530a8e6862f9ba41cad05ecbd5b7b91752ca1c5af0c6) The default export getPlugin in index.js constructs an HTTPS URL from split constants pointing at the bare IP 46.183.25.232:45000/icons/108, fetches the response, and passes the response field data.credits to new Function(...) with require, module, exports, process, Buffer, and global injected as parameters. Any caller invoking the exported function grants the remote endpoint arbitrary code execution in the Node.js process with full host privileges. The endpoint is disguised with icon/CDN vocabulary (iconDomain, font-awesome/svgs/brands, a 'bearrtoken' field literal 'logo') and an unused IconProvider map, while the package advertises itself as a 'custom API library' — the icon framing is cover for the fetch-and-eval path. The payload is mutable, unpinned, unauthenticated, and served over a bare-IP host unrelated to any legitimate publisher infrastructure.

Announced Source revision 1
Original source ↗

MAL-2026-12416

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:MAL-2026-12416

poly-custom-api

Source reference: /affected/0/package/name

Affected versions
5.3.1

Source reference: /affected/0/versions

Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "package": {
      "name": "poly-custom-api",
      "purl": "pkg:npm/poly-custom-api",
      "ecosystem": "npm"
    },
    "versions": [
      "5.3.1"
    ],
    "database_specific": {
      "cwes": [
        {
          "name": "Embedded Malicious Code",
          "cweId": "CWE-506",
          "description": "The product contains code that appears to be malicious in nature."
        }
      ],
      "source": "https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/poly-custom-api/MAL-2026-12416.json",
      "indicators": {
        "evidence_files": [
          {
            "path": "index.js",
            "tlsh": "30c1616546fa31a36a67e4eef30f10027165e313365de971f48e42902fca568e5f24e8",
            "sha256": "ce2c680ca6b7355d73cbc131465fc6b2f2508f367b57ecb27a3b05e6e247213f"
          }
        ],
        "package_integrity": [
          {
            "hashes": {
              "sha1": "09dc2e523079cf687c0330e52558c97354e5abca",
              "sha512_sri": "sha512-RSR9waszWVq+MZd+I7SpD7Nl7L6rKVM8CLcLlEFXtKV+xAPt8oAbFca1z/EzyOvr86tGaRVXFTURXE/9vScfeA=="
            },
            "filename": "poly-custom-api-5.3.1.tgz"
          }
        ]
      }
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#11017 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement