MAL-2026-13527

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bnpl-blocks-atom-bnpl-checkbox/MAL-2026-13527.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13527
Published
2026-08-07T12:27:36Z
Modified
2026-08-07T13:20:15.686486074Z
Summary
Malicious code in bnpl-blocks-atom-bnpl-checkbox (npm)
Details

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

Source: amazon-inspector (3db8a9fa19a0529093120a57fddb0821928cd0050c4f9062956eb73a80fc17b0)

On require() of the package main, polyfill.js runs an async bootstrap that reconstructs network destinations from string-split fragments (require("child"+"process"), array-join of hostname fragments), fetches a platform-specific binary payload via https.get from Cloudflare Workers hosts (oob-worker.cf100-416.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf103-070.workers.dev) with a DNS-TXT chunked fallback via sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru, writes the bytes to a temp path under a disguised filename, chmods 0755, and spawns it detached via cp.spawn('/bin/sh',['-c', filePath+' &'],{detached:true}). No version pinning, no hash/signature verification, and destinations are unrelated to the package's advertised purpose. lib/telemetry.js contains a dormant second copy of the same drop-and-spawn shape (base64 chunk decoding, chmod 0755, detached /bin/sh spawn), currently unreachable from index.js. The 'analytics' framing and split-string obfuscation of both the child_process import and the hostnames are cover-story evasion of static analysis.

Database specific 
{
    "malicious-packages-origins": [
        {
            "source": "amazon-inspector",
            "modified_time": "2026-08-07T12:27:36Z",
            "import_time": "2026-08-07T12:51:21.161255Z",
            "versions": [
                "35.6.1"
            ],
            "sha256": "3db8a9fa19a0529093120a57fddb0821928cd0050c4f9062956eb73a80fc17b0",
            "id": "IN-MAL-2026-016989"
        }
    ]
}
References
Credits

Affected packages

npm / bnpl-blocks-atom-bnpl-checkbox

Package

Name
bnpl-blocks-atom-bnpl-checkbox
View open source insights on deps.dev
Purl
pkg:npm/bnpl-blocks-atom-bnpl-checkbox

Affected ranges

Affected versions

35.*
35.6.1

Database specific

source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bnpl-blocks-atom-bnpl-checkbox/MAL-2026-13527.json"
indicators 
{
    "evidence_files": [
        {
            "tlsh": "2ea1b65a127630198bb0d7e4c7175416f66ae6633380c294fb9ca9985f7312483b2dfc",
            "sha256": "42f36a9e4fc18f0eb2347077c09c25ac2772a488a598ba2ef3122d9c52c28d91",
            "path": "_polyfill.js"
        },
        {
            "tlsh": "7c835056566a142186b2b368df234107ff3685272643429dbafc82dc1fbd72092a5ffc",
            "sha256": "e65d5e4911aa7e28c0a4fd310d658307d3f3a0ee4d39d9239d6b54a63eee02b1",
            "path": "lib/telemetry.js"
        }
    ],
    "package_integrity": [
        {
            "filename": "bnpl-blocks-atom-bnpl-checkbox-35.6.1.tgz",
            "hashes": {
                "sha512_sri": "sha512-B506bWlNPOJeGZMDzPbnqYI8QoT/mxYXH2d2PpD6sKAgqpcSGf/EhCmdWO4dds1zlb2RCf6PU5p2IkfR2BoXGA==",
                "sha1": "67ece4fb3069c2d3f2d1eb8f8917f67e02debbd4"
            }
        }
    ]
}
cwes 
[
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    }
]