MAL-2026-16317

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/testmgkregme/MAL-2026-16317.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-16317
Published
2026-09-21T03:23:55Z
Modified
2026-09-21T03:30:17Z
Summary
Malicious code in testmgkregme (npm)
Details

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

Source: amazon-inspector (496e8021fd5e2626c503e2ceeed8349ff15c68c71a5f19d8a57c67e5f1b41863)

npm package testmgkregme@1.0.1 uses a binding.gyp whose sources field employs GYP command-expansion (<!(env node index.js...; echo stub.c)) to run node index.js during node-gyp rebuild, which npm invokes automatically when a binding.gyp is present. No native source files (.c/.cc/.cpp/.h) are shipped, so the binding.gyp exists solely to trigger install-time code execution rather than to build a native addon. The executed index.js is a 2.9 MB single-IIFE wrapper: an outer Caesar-cipher (ROT k=4) layer is passed to eval, and the decoded body then AES-128-GCM-decrypts hardcoded hex ciphertexts with a hardcoded key/IV/authTag and evals the plaintext. The multi-layer ROT->eval->AES->eval construction has no legitimate purpose and conceals the runtime payload from static review. The result is that npm install testmgkregme causes opaque attacker-authored JavaScript to execute on the installer's machine with the installer's privileges.

Database specific 
{
    "malicious-packages-origins":  [
        {
            "id":  "IN-MAL-2026-020213",
            "import_time":  "2026-09-21T03:24:22.111938553Z",
            "modified_time":  "2026-09-21T03:23:55Z",
            "sha256":  "496e8021fd5e2626c503e2ceeed8349ff15c68c71a5f19d8a57c67e5f1b41863",
            "source":  "amazon-inspector",
            "versions":  [
                "1.0.1"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / testmgkregme

Package

Name
testmgkregme
View open source insights on deps.dev
Purl
pkg:npm/testmgkregme

Affected ranges

Affected versions

1.*
1.0.1

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":  "binding.gyp",
            "sha256":  "1bf3341b5633219a6e25b95cc21b0915eafa9a2d0571b4eaf90f128aac4c8abd",
            "tlsh":  "b6c08c2df83c480525dd186441688802a4a040a348462d04b69e20389fa900b689c29e"
        },
        {
            "path":  "index.js",
            "sha256":  "3fa0c205e38cc21ba2f31decaf40dd570f172ccf0087d2459dc555fdaacb0ff3",
            "tlsh":  "3dd5ff6bab8a1be4a474ccf3b3497693f0b5c95f3951307966934b73f82ee16c520a10"
        }
    ],
    "package_integrity":  [
        {
            "filename":  "testmgkregme-1.0.1.tgz",
            "hashes":  {
                "sha1":  "39b5dfc447642ed825c54a6ec16e3afbdd49e52f",
                "sha512_sri":  "sha512-xsKzZROzVdKmataoUd9OhroZifu6WGNXG51DDB9m/+r/2hpl3g8dzzYYsmlmhySxXM2E7LQR+ou3ytEZLHV4Pw=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/testmgkregme/MAL-2026-16317.json"