MAL-2026-13423
Vulnerability from ossf_malicious_packages
Published
2026-08-06 13:56
Modified
2026-08-06 13:56
Summary
Malicious code in fetchrtds (npm)
Details

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

Source: amazon-inspector (74e0a6afc9e0684beee9d75d2f4966507178bed2499c8f5453629a0b827a80ef)

On npm install, the package's postinstall script reads a config URL (defaulting to https://slimopump.vercel.app/config/clob-math.json), fetches a.tgz bundle referenced by that config, extracts it, runs npm install inside the extracted directory, then require()s the extracted peer-math.js and invokes syncSession(). The remote bundle is unpinned and unverified (no hash/signature check), and the host is not the package's registry or a publisher-matched domain, so arbitrary Node code chosen by the operator of slimopump.vercel.app executes on the installer's machine at install time. The advertised purpose (Polymarket/Chainlink TWAP via RTDS WebSocket) does not match the shipped code, which is limited to a trivial Kelly-stake arithmetic helper (computeKellyStake/formatStakeUsd/roundStake) — the functional payload is delivered exclusively via the postinstall fetch.

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": "scripts/install-check.cjs",
              "sha256": "3e15f1692c4075cf29cefa94c84d564a95086ab7a6838a97ea25cd02475a282d",
              "tlsh": "6ad1659915a272770bb0e7a4cb53a41eeb6394233511c364f6cdc6952ff6164c213dec"
            },
            {
              "path": "package.json",
              "sha256": "20bd28b0dfedcff6a8b1eaa77ecaa7928140269ddaaa3019b5c5ce7750d2dd43",
              "tlsh": "c7f02837daa08d3728b8ca8a59255000f5554b2f62a44c0bb1bba15c8fb756205abb65"
            }
          ],
          "package_integrity": [
            {
              "filename": "fetchrtds-1.1.0.tgz",
              "hashes": {
                "sha1": "2befab02b56bbb8e2440ef6b1755ad646705301f",
                "sha512_sri": "sha512-d1BNLgAp9oQtmuqPa5nHuOx8gTUZlx5j+1VMFIGl+WHvt5JqFrx9PNrW2eyJOHXNs9LQ3kZib0PcNYejicWAhg=="
              }
            }
          ]
        }
      },
      "package": {
        "ecosystem": "npm",
        "name": "fetchrtds"
      },
      "versions": [
        "1.1.0"
      ]
    }
  ],
  "credits": [
    {
      "contact": [
        "inspector-research@amazon.com"
      ],
      "name": "Amazon Inspector",
      "type": "FINDER"
    }
  ],
  "database_specific": {
    "malicious-packages-origins": [
      {
        "id": "IN-MAL-2026-016547",
        "import_time": "2026-08-06T14:19:54.861291768Z",
        "modified_time": "2026-08-06T13:56:39Z",
        "sha256": "74e0a6afc9e0684beee9d75d2f4966507178bed2499c8f5453629a0b827a80ef",
        "source": "amazon-inspector",
        "versions": [
          "1.1.0"
        ]
      }
    ]
  },
  "details": "\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (74e0a6afc9e0684beee9d75d2f4966507178bed2499c8f5453629a0b827a80ef)\nOn npm install, the package\u0027s postinstall script reads a config URL (defaulting to https://slimopump.vercel.app/config/clob-math.json), fetches a.tgz bundle referenced by that config, extracts it, runs `npm install` inside the extracted directory, then require()s the extracted `peer-math.js` and invokes `syncSession()`. The remote bundle is unpinned and unverified (no hash/signature check), and the host is not the package\u0027s registry or a publisher-matched domain, so arbitrary Node code chosen by the operator of slimopump.vercel.app executes on the installer\u0027s machine at install time. The advertised purpose (Polymarket/Chainlink TWAP via RTDS WebSocket) does not match the shipped code, which is limited to a trivial Kelly-stake arithmetic helper (computeKellyStake/formatStakeUsd/roundStake) \u2014 the functional payload is delivered exclusively via the postinstall fetch.\n",
  "id": "MAL-2026-13423",
  "modified": "2026-08-06T13:56:39Z",
  "published": "2026-08-06T13:56:39Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://www.npmjs.com/package/fetchrtds/v/1.1.0"
    }
  ],
  "schema_version": "1.7.4",
  "summary": "Malicious code in fetchrtds (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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