MAL-2026-13604
Vulnerability from ossf_malicious_packages
Published
2026-08-07 12:29
Modified
2026-08-07 12:29
Summary
Malicious code in tailwindcss-motion-advanced (npm)
Details

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

Source: amazon-inspector (6b8426c39ffcba11d95e8ede8085ce260dbcf8527544ce9ca3a1d7a59618f0eb)

On require of the package's main entry, lib/utils.min.js queries Ethereum RPC endpoints (eth.blockscout.com/api, 1rpc.io/eth, eth.drpc.org, ethereum-rpc.publicnode.com, eth-mainnet.public.blastapi.io) for the latest outbound transaction from the hardcoded address 0xa322E5f3D311D3080e6f0121063e9aDC2490Ef1a, parses two IPv4 C2 hosts from the transaction's to field, fetches an XOR-encoded JavaScript payload over plain HTTP at http://<ip>:443/0x/cls, decodes it, and executes it via both eval and a detached spawn('node', ['-e', payload]). Sensitive identifiers (http, https, child_process, zlib, url, URLs, HTTP methods, header names, the attacker address) are hidden behind \uXXXX unicode escapes, and the response body and x-payload-b64 header are XOR-decoded with a per-URL key before execution. The package is presented as a Tailwind CSS plugin and has no legitimate need for Ethereum RPC access, IP derivation from on-chain data, or execution of remotely fetched code.

CWE
  • CWE-506 - The product contains code that appears to be malicious in nature.
Credits

{
  "affected": [
    {
      "database_specific": {
        "cwes": [
          {
            "cweId": "CWE-506",
            "description": "The product contains code that appears to be malicious in nature.",
            "name": "Embedded Malicious Code"
          }
        ],
        "indicators": {
          "evidence_files": [
            {
              "path": "lib/utils.min.js",
              "sha256": "bb2f325edfc3e4383d88b985aa203f13d238612dd0487405e808dc9cf64720e3",
              "tlsh": "d4021ea05379adba82315a44cc34be0de1b4dcb56d4bd02af82b3c89dd7a1d08b9176c"
            }
          ],
          "package_integrity": [
            {
              "filename": "tailwindcss-motion-advanced-1.0.1.tgz",
              "hashes": {
                "sha1": "1ce4726fe123faf79f41407b1583c4e7b4926a81",
                "sha512_sri": "sha512-M1xGRmzww82urGhMmdnomkXC6i9fFGjwDAgjV2jbA0cPcoSOQf34qTxLkfbwUptGeW8nN/IFXaXdbeYXI5cQtg=="
              }
            }
          ]
        }
      },
      "package": {
        "ecosystem": "npm",
        "name": "tailwindcss-motion-advanced"
      },
      "versions": [
        "1.0.1"
      ]
    }
  ],
  "credits": [
    {
      "contact": [
        "inspector-research@amazon.com"
      ],
      "name": "Amazon Inspector",
      "type": "FINDER"
    }
  ],
  "database_specific": {
    "malicious-packages-origins": [
      {
        "id": "IN-MAL-2026-017004",
        "import_time": "2026-08-07T12:51:21.825236508Z",
        "modified_time": "2026-08-07T12:29:45Z",
        "sha256": "6b8426c39ffcba11d95e8ede8085ce260dbcf8527544ce9ca3a1d7a59618f0eb",
        "source": "amazon-inspector",
        "versions": [
          "1.0.1"
        ]
      }
    ]
  },
  "details": "\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (6b8426c39ffcba11d95e8ede8085ce260dbcf8527544ce9ca3a1d7a59618f0eb)\nOn require of the package\u0027s main entry, lib/utils.min.js queries Ethereum RPC endpoints (eth.blockscout.com/api, 1rpc.io/eth, eth.drpc.org, ethereum-rpc.publicnode.com, eth-mainnet.public.blastapi.io) for the latest outbound transaction from the hardcoded address 0xa322E5f3D311D3080e6f0121063e9aDC2490Ef1a, parses two IPv4 C2 hosts from the transaction\u0027s `to` field, fetches an XOR-encoded JavaScript payload over plain HTTP at `http://\u003cip\u003e:443/0x/cls`, decodes it, and executes it via both `eval` and a detached `spawn(\u0027node\u0027, [\u0027-e\u0027, payload])`. Sensitive identifiers (`http`, `https`, `child_process`, `zlib`, `url`, URLs, HTTP methods, header names, the attacker address) are hidden behind \\uXXXX unicode escapes, and the response body and `x-payload-b64` header are XOR-decoded with a per-URL key before execution. The package is presented as a Tailwind CSS plugin and has no legitimate need for Ethereum RPC access, IP derivation from on-chain data, or execution of remotely fetched code.\n",
  "id": "MAL-2026-13604",
  "modified": "2026-08-07T12:29:45Z",
  "published": "2026-08-07T12:29:45Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://www.npmjs.com/package/tailwindcss-motion-advanced/v/1.0.1"
    }
  ],
  "schema_version": "1.7.4",
  "summary": "Malicious code in tailwindcss-motion-advanced (npm)"
}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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