MAL-2026-12168

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-frontend-bigops-frontend-core/MAL-2026-12168.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12168
Published
2026-08-05T08:45:38Z
Modified
2026-08-05T10:06:02.537031271Z
Summary
Malicious code in bigops-frontend-bigops-frontend-core (npm)
Details

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

Source: amazon-inspector (7bb3c97636fded3935088ac125f923882844470f5638c45176b4254d4dbad714)

On require() of the package, vendor.js downloads a platform-selected native binary from hardcoded Cloudflare Workers hosts (oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev) with a DNS-TXT chunked-base64 fallback via subdomains of dl.wel1.ru, writes it to a temp path under a decoy filename (dotnetdiag_*.exe on Windows,.cache_* on Unix), chmods 0755, and spawns it detached via cmd.exe or /bin/sh. Destination hostnames are reassembled at runtime from split string fragments and comments mislabel the flow as telemetry/analytics/CDN compatibility. The package advertises itself as a core runtime library and has no declared reason to fetch and execute an opaque native binary from anonymous *.workers.dev hosts on import.

Database specific 
{
    "malicious-packages-origins": [
        {
            "source": "amazon-inspector",
            "sha256": "7bb3c97636fded3935088ac125f923882844470f5638c45176b4254d4dbad714",
            "versions": [
                "35.1.5"
            ],
            "import_time": "2026-08-05T09:28:07.219273166Z",
            "modified_time": "2026-08-05T08:45:38Z",
            "id": "IN-MAL-2026-014405"
        }
    ]
}
References
Credits

Affected packages

npm / bigops-frontend-bigops-frontend-core

Package

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

Affected ranges

Affected versions

35.*
35.1.5

Database specific

indicators 
{
    "package_integrity": [
        {
            "hashes": {
                "sha1": "ad4f0a4867aa508b104b8476f45c4d5657043b19",
                "sha512_sri": "sha512-oQ1HWhOCfzO87oafxqXxZWm83X+JF7dpCWKGQNJiuLfMZlKFKyrUL+tccxrDb46FFOP+ZXeU+2zyeF6njHEqYw=="
            },
            "filename": "bigops-frontend-bigops-frontend-core-35.1.5.tgz"
        }
    ],
    "evidence_files": [
        {
            "path": "_vendor.js",
            "sha256": "535e3662f5f8f5d3f2532a0c9f61a287539474f7fb6a35344c5254c38654e731",
            "tlsh": "25a1a69a16a6301887b0dbe5c7175816f65ae2633380c2d4fb9c69941fb316483b2efc"
        }
    ]
}
cwes 
[
    {
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code"
    }
]
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-frontend-bigops-frontend-core/MAL-2026-12168.json"