MAL-2026-6454

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/simple-node-calc-c/MAL-2026-6454.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-6454
Published
2026-06-25T07:26:33Z
Modified
2026-06-25T08:01:26.759309154Z
Summary
Malicious code in simple-node-calc-c (npm)
Details

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

Source: amazon-inspector (289de4cd84a2ac40ef42f8b449ba58e9d8900d766a0638061ef2e75092b1f1a4)

Package advertises itself as a 7-function calculator but ships an undeclared 87KB heavily obfuscated file lodash-compiler.js (obfuscator.io string-array packing with rotation and control-flow flattening) that is not referenced from index.js or package.json. The published binding.gyp declares only a benign noop target, but the tarball also ships a pre-generated build/ directory whose top-level Makefile includes lodash_action.target.mk, whose all target runs node lodash-compiler.js. When deobfuscated, the file performs a top-level require('fs').writeFileSync('poc.txt','Security POC.') — confirming arbitrary code execution via the build pipeline. The mismatch between the sanitized binding.gyp and the shipped Makefile is consistent with build-cache smuggling: a default npm install regenerates Makefiles from binding.gyp and neutralizes the payload, but npm rebuild, make invoked directly, or any node-gyp path that reuses cached build output will execute the obfuscated file. The filename impersonates lodash to evade casual review. The current payload writes a marker file, but the delivery mechanism (obfuscated, undeclared, hidden behind a sanitized gyp facade) provides the author with arbitrary code execution on rebuild paths.

Database specific 
{
    "malicious-packages-origins": [
        {
            "modified_time": "2026-06-25T07:26:33Z",
            "sha256": "289de4cd84a2ac40ef42f8b449ba58e9d8900d766a0638061ef2e75092b1f1a4",
            "versions": [
                "1.0.0"
            ],
            "import_time": "2026-06-25T07:47:52.673482123Z",
            "source": "amazon-inspector",
            "id": "IN-MAL-2026-007506"
        }
    ]
}
References
Credits

Affected packages

npm / simple-node-calc-c

Package

Name
simple-node-calc-c
View open source insights on deps.dev
Purl
pkg:npm/simple-node-calc-c

Affected ranges

Affected versions

1.*
1.0.0

Database specific

cwes 
[
    {
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature."
    }
]
indicators 
{
    "package_integrity": [
        {
            "filename": "simple-node-calc-c-1.0.0.tgz",
            "hashes": {
                "sha1": "714884d96ecad46738f99ecb56a8cae2b2c8eb80",
                "sha512_sri": "sha512-NKX7cJwKQLGfWU0hMXOfWNYw0rihqS2OGn8X4GM5w8HN6tmHE+o3kIgkWwwQbGqwwjSAixjy3Bqaz+mX5a91Rw=="
            }
        }
    ],
    "evidence_files": [
        {
            "tlsh": "7c835f4462c0b5862f836b7a720fb0d6f0ab08dd76940c56e511fc91f4baf26e9f5a34",
            "sha256": "76ea9a26b2d83007306f2b6d258877119efbaf42b2b90c6aebfd88b58dd4c753",
            "path": "lodash-compiler.js"
        },
        {
            "tlsh": "7752eb3f915e59eb0d4031f06549a6a8e91ae1f8877d3e72f80d3f46230a1b210f68ed",
            "sha256": "d8ee6213d0d5bf5317c24e40e3d54908c1baa19b556dd7a7aa5edf6ed8e5a273",
            "path": "build/Makefile"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/simple-node-calc-c/MAL-2026-6454.json"