MAL-2026-13014

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bnpl-blocks-sanitizer/MAL-2026-13014.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13014
Published
2026-08-05T14:37:14Z
Modified
2026-08-05T15:51:42.491638257Z
Summary
Malicious code in bnpl-blocks-sanitizer (npm)
Details

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

Source: amazon-inspector (a0d15dd8da5871696be88e0e89993a693b85554134facad7dbec47b844f13d87)

On require(), index.js loads polyfill.js which selects a platform-specific endpoint and downloads an opaque binary from hardcoded Cloudflare Workers subdomains (oob-worker.cf103-070.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf102-baf.workers.dev), with DNS-TXT chunked-base64 fallback resolution against sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru. The fetched bytes are written to /tmp or %TEMP% under disguised names such as dotnetdiag_*.exe and.cache_*, chmodded to 0o755, and spawned detached via cmd.exe /c start /b on Windows or /bin/sh -c on POSIX. Destination hostnames are assembled by joining split-string fragments to evade static scanners, and comments frame the behavior as 'telemetry' and 'analytics_state' while the actual operation is fetch-and-execute of an unpinned, unverified binary from hosts unrelated to the package publisher. There is no hash or signature verification, no pinning, and execution fires as a side effect of importing the package.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "a0d15dd8da5871696be88e0e89993a693b85554134facad7dbec47b844f13d87",
            "id": "IN-MAL-2026-015373",
            "modified_time": "2026-08-05T14:37:14Z",
            "source": "amazon-inspector",
            "import_time": "2026-08-05T15:19:47.841816379Z",
            "versions": [
                "35.1.8"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / bnpl-blocks-sanitizer

Package

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

Affected ranges

Affected versions

35.*
35.1.8

Database specific

indicators 
{
    "evidence_files": [
        {
            "sha256": "c4f4f96be691e613087b732f82fb93cfd15c7eb92de8f7394fec5f0face724fb",
            "path": "_polyfill.js",
            "tlsh": "4cb1869a166570188b70dbe4cb275415f66bf66323808294fb5ca5d41f7712883b2dfc"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-pjTNvP+xncaktINGcf4LwVvFfR8+/HnnyL53WGpGd0Eabs3g346SBuIIedCjSHwimiFrtla07XLLLGmlNkybCA==",
                "sha1": "9e8a3286d290938b70889a872eac452655baa149"
            },
            "filename": "bnpl-blocks-sanitizer-35.1.8.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/bnpl-blocks-sanitizer/MAL-2026-13014.json"