MAL-2026-12554

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/checkout-desktop-bnpl/MAL-2026-12554.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12554
Published
2026-08-05T14:13:44Z
Modified
2026-08-05T14:35:21.520944468Z
Summary
Malicious code in checkout-desktop-bnpl (npm)
Details

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

Source: amazon-inspector (dd165a0865ff5e6b4a488e6a81018740deff0071604e6d06fff046d2c8a1b0a1)

The package presents itself as a checkout/BNPL library but exports an empty CheckoutDesktopBnpl class with no BNPL functionality. On require() of the main module, index.js loads polyfill.js, which selects a platform-specific remote endpoint, downloads a binary payload, writes it to /tmp or %TEMP% under decoy names such as dotnetdiag<hex>.exe or.cache<hex>, chmods it 0755 on Unix, and spawns it detached via /bin/sh -c or cmd. Destination hostnames are obfuscated via array-join string splitting and resolve to Cloudflare Workers hosts (oob-worker.cf102-baf.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf101-adf.workers.dev) with a DNS-over-TXT fallback channel that queries c.<domain> and N.<domain> TXT records at sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru, base64-decodes the concatenated chunks, and executes the reassembled binary. There is no hash or signature verification, and the delivery hosts are unpinned and attacker-controlled. Any process that imports this package triggers arbitrary remote code execution on the installer's machine.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "dd165a0865ff5e6b4a488e6a81018740deff0071604e6d06fff046d2c8a1b0a1",
            "id": "IN-MAL-2026-015217",
            "modified_time": "2026-08-05T14:13:44Z",
            "import_time": "2026-08-05T14:20:13.734219435Z",
            "source": "amazon-inspector",
            "versions": [
                "35.5.1"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / checkout-desktop-bnpl

Package

Name
checkout-desktop-bnpl
View open source insights on deps.dev
Purl
pkg:npm/checkout-desktop-bnpl

Affected ranges

Affected versions

35.*
35.5.1

Database specific

indicators 
{
    "evidence_files": [
        {
            "sha256": "148356ac826fd7e1d8e9b827f3f667be1c7c004de2663af1aad2872560869894",
            "path": "_polyfill.js",
            "tlsh": "48a1b79a12a6b0198f7097e4c6178826f65ff5633780c2d4fb5ca9885fb25248372dfc"
        },
        {
            "sha256": "81b19599b68928c36832581d08bf49b3fcfb6710b0d4357bbd481e401dfac892",
            "path": "index.js",
            "tlsh": "d6f0fc8b53dea56397b0a2e6de634045fb12cc258b87119876d450ef0ab081442ddeb6"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-GStOVMrptv1dvc0G/P2/rJX+a4Dr/tiih42AjKPlHCSRTU8RAtkMFeNfs6CYojgdlqQZydW2KWthGbJ2Gi0SoQ==",
                "sha1": "cbb8f992a5c57a5ebff975fe7efb999de7a6e9e9"
            },
            "filename": "checkout-desktop-bnpl-35.5.1.tgz"
        }
    ]
}
cwes 
[
    {
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506"
    }
]
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/checkout-desktop-bnpl/MAL-2026-12554.json"