MAL-2026-16307

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/chai-testing/MAL-2026-16307.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-16307
Published
2026-09-21T03:20:32Z
Modified
2026-09-21T03:30:17Z
Summary
Malicious code in chai-testing (npm)
Details

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

Source: amazon-inspector (da6bebc82e500e38b0ab9c507b1d56c18a05a1ffd04fcee60f0dcad991c8944a)

The package's main entry (index.js) spawns a detached node lib/caller.js when the module is required. caller.js base64-decodes a hardcoded URL (https://ipcheck-hashed.vercel.app/api/auth/...) stored in a fake process.env.DEV_API_KEY constant, POSTs to that endpoint via axios, and executes the returned body by constructing a Function and invoking it with Node's require. The endpoint and header values are base64-encoded and decoded with atob at runtime to hide the destination from review. The package name and README metadata mimic legitimate chai/pino testing and logging libraries, but the shipped code is unrelated to any advertised functionality. Requiring the module — including via the exported middleware, which invokes the dropper as a side effect — triggers execution of attacker-controlled JavaScript with full Node privileges on the installer's host.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-020205",
            "import_time": "2026-09-21T03:24:21.201468408Z",
            "modified_time": "2026-09-21T03:20:32Z",
            "sha256": "da6bebc82e500e38b0ab9c507b1d56c18a05a1ffd04fcee60f0dcad991c8944a",
            "source": "amazon-inspector",
            "versions": [
                "1.1.4"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / chai-testing

Package

Name
chai-testing
View open source insights on deps.dev
Purl
pkg:npm/chai-testing

Affected ranges

Affected versions

1.*
1.1.4

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": "lib/caller.js",
            "sha256": "bc5103643540917e994c3daa22faaee3701ab634a10bd4383e856b72cdba283f",
            "tlsh": "d601b88960fd141c016622e5272fa4326450e86b394ad9d4374cc3424fae6be7aa3bdf"
        },
        {
            "path": "package.json",
            "sha256": "abb46d4d95c16dc8ddfdbcd2d31da457ac3a1eccb2428e76acab6eac03e8ec1c",
            "tlsh": "1301cb61ceb48e2301dd21925c2e0243b6718c439928fc2d32d7522d4fad9bf01bf21d"
        }
    ],
    "package_integrity": [
        {
            "filename": "chai-testing-1.1.4.tgz",
            "hashes": {
                "sha1": "b7f72300d4e54d2cfa10cf1a58a5ea01117a1e1b",
                "sha512_sri": "sha512-BjwzhMHBLMBApcQvD5zfUdYAu2W1yhLd0n2dGU4qFZ/+h8U9ZE4MDik5YIFJn8d3YZjh7QOkPNnAOXzUUkKvAQ=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/chai-testing/MAL-2026-16307.json"