MAL-2026-12959

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bnpl-blocks-independent-bnpl-main-banner/MAL-2026-12959.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12959
Published
2026-08-05T14:44:41Z
Modified
2026-08-05T15:51:17Z
Summary
Malicious code in bnpl-blocks-independent-bnpl-main-banner (npm)
Details

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

Source: amazon-inspector (37df8b5a29c08cca1da2d6cc77c5672f9c23ce6877b148c3bef277d0dbaa1d4e)

index.js requires./polyfill on module load. polyfill.js selects a platform-specific branch (linux_x64, linux_arm64, darwin, win32), assembles destination hostnames via per-character string joins (e.g. Cloudflare Workers hosts under oob-worker.cf*.workers.dev and a discovery domain under sdk.dl.wel1.ru), downloads an opaque binary, writes it to /tmp or %TEMP% under a disguised name such as.cache or dotnet_diag.exe, chmods 0755 on Unix, and spawns it detached via /bin/sh -c ' &' or cmd /c start. A DNS TXT fallback reconstructs the payload from base64-chunked TXT records served across numbered subdomains (c. for count, i. pieces joined and base64-decoded) when HTTPS retrieval is blocked. The destinations are non-publisher, string-obfuscated hosts; the fetched bytes are executed on the installer's machine at library load with no signature, hash, or publisher verification.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-015424",
            "import_time": "2026-08-05T15:19:50.631237182Z",
            "modified_time": "2026-08-05T14:44:41Z",
            "sha256": "37df8b5a29c08cca1da2d6cc77c5672f9c23ce6877b148c3bef277d0dbaa1d4e",
            "source": "amazon-inspector",
            "versions": [
                "35.4.4"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / bnpl-blocks-independent-bnpl-main-banner

Package

Name
bnpl-blocks-independent-bnpl-main-banner
View open source insights on deps.dev
Purl
pkg:npm/bnpl-blocks-independent-bnpl-main-banner

Affected ranges

Affected versions

35.*
35.4.4

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": "_polyfill.js",
            "sha256": "952c6df27be71d3365a610759aee5ce0cf6b2b91b402434f98b4365040656eea",
            "tlsh": "8ba1969a16aa31188bb0a7e4c7175416f55bf2633380c2d4f79c65985fb31248372efc"
        }
    ],
    "package_integrity": [
        {
            "filename": "bnpl-blocks-independent-bnpl-main-banner-35.4.4.tgz",
            "hashes": {
                "sha1": "c62921a17e53200ad8cf0ed4ee65662550097579",
                "sha512_sri": "sha512-ZobvFUFeOVhOoa57Zsi+mAwSWE+hsQalYAbP/JyWXvDP4A9dJgDTUxWzc2hCzJANr6MWgG5Ifj0qBv/PNw7row=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bnpl-blocks-independent-bnpl-main-banner/MAL-2026-12959.json"