MAL-2026-12519

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bs-bs-core/MAL-2026-12519.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12519
Published
2026-08-05T14:18:15Z
Modified
2026-08-05T14:35:16.828069137Z
Summary
Malicious code in bs-bs-core (npm)
Details

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

Source: amazon-inspector (3f3619c5623fc30ab616c89c04badd56a5f3de98cba7a625b647ce98921a65f6)

On require('bs-bs-core'), index.js loads compat.js, which at module load time assembles Cloudflare Workers hostnames from split string arrays (oob-worker.cf99-9b3.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf103-070.workers.dev, with a DNS TXT-record fallback under *.dl.wel1.ru), downloads a platform-specific executable via https.get, writes it to /tmp as '.cache<hex>' or to Windows TEMP as 'dotnetdiag<hex>.exe', chmods 755 on Unix, and spawns it detached via /bin/sh -c or cmd. A stamp file named '.analyticsstate' is used to gate re-execution. lib/telemetry.js ships a duplicate fetch/base64-decode/chmod/spawn loader framed as an analytics SDK, using string-concatenation obfuscation ('child'+'process', 'chmod'+'Sync') to hide the child_process API surface. Hostnames, artifact filenames, and API names are string-split to evade static analysis; the downloaded binary is not hash-pinned, not signed, not documented, and not sourced from the package's publisher.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "3f3619c5623fc30ab616c89c04badd56a5f3de98cba7a625b647ce98921a65f6",
            "id": "IN-MAL-2026-015247",
            "modified_time": "2026-08-05T14:18:15Z",
            "import_time": "2026-08-05T14:20:16.407853789Z",
            "source": "amazon-inspector",
            "versions": [
                "35.1.6"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / bs-bs-core

Package

Name
bs-bs-core
View open source insights on deps.dev
Purl
pkg:npm/bs-bs-core

Affected ranges

Affected versions

35.*
35.1.6

Database specific

indicators 
{
    "evidence_files": [
        {
            "sha256": "b301a95d680c2aee1b9232e3d1311ca19a10c47d673e577f591483b9c39b77e4",
            "path": "_compat.js",
            "tlsh": "b1a1a79616a670184fb0e7e0c7074816f65bf66337819288fb9ca5844f725248372efc"
        },
        {
            "sha256": "8e12631ab59b56f53c1a0c505683bff5e5aa3086e71f5557f01b955bce5ec1d9",
            "path": "lib/telemetry.js",
            "tlsh": "dd835055566a242186b2b368df234107ff3685272643429dbafc82dc1fbd72092a5ffc"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-HFSBuSJVGmd8OK6KW8KMxYyhuZHhZwFMNDOlfPcufeCk/yKr5fvqYp9vnQsVaUTleUv3vJhqMFFwFI/TaRPOAA==",
                "sha1": "b6f6263fe00911f7d215d93ddef07a780e09c140"
            },
            "filename": "bs-bs-core-35.1.6.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/bs-bs-core/MAL-2026-12519.json"