MAL-2026-6220

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/chai-as-uphelded/MAL-2026-6220.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-6220
Published
2026-06-19T15:00:03Z
Modified
2026-06-19T15:47:25.100055490Z
Summary
Malicious code in chai-as-uphelded (npm)
Details

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

Source: amazon-inspector (aa7f5470790594e55393048fee0e7a9e6e6650776a06717258e410292d4dc8a9)

Package name impersonates the popular chai-as-promised library, but its package.json description and keywords masquerade as a pino-style logger and an unrelated vulnerability-management document — a deliberate metadata cover. The default export is an Express-style middleware that, when invoked, spawns a detached node./lib/caller.js. caller.js base64-decodes a URL to https://api.jsonstorage.net/v1/json/2ef8c758-a96f-459e-b036-b3b90379a165/a179ea35-b962-4722-b3f1-e28316d1a44a, GETs JSON, and passes the response's cookie field directly to new Function.constructor('require', s)(require) — evaluating attacker-controlled JavaScript with full access to Node's require. The endpoint is mutable third-party storage, the URL is obscured via base64, and the executed payload is opaque. Any consumer that uses the package's documented middleware (or runs the package's own smoke script) reaches the eval sink.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "aa7f5470790594e55393048fee0e7a9e6e6650776a06717258e410292d4dc8a9",
            "source": "amazon-inspector",
            "modified_time": "2026-06-19T15:00:03Z",
            "versions": [
                "6.11.4"
            ],
            "id": "IN-MAL-2026-007071",
            "import_time": "2026-06-19T15:41:55.233191322Z"
        }
    ]
}
References
Credits

Affected packages

npm / chai-as-uphelded

Package

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

Affected ranges

Affected versions

6.*
6.11.4

Database specific

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/chai-as-uphelded/MAL-2026-6220.json"
indicators 
{
    "evidence_files": [
        {
            "sha256": "37e9dde0f35864e2ea8dcd4c8b5324ef50e3798195d04c30ba6938352af702db",
            "tlsh": "1b01af9934fe541c015112e9171fa1326050e4673d86e6c83b4c87129fa667e6e93adf",
            "path": "lib/caller.js"
        },
        {
            "sha256": "b2411fc60ca4abb54fbcd1909a20b1d99849bea7fce6174aabde28d6f851daed",
            "tlsh": "c4019765ceb89e2300dd21824c2a0243b6619c539928fd2932d7a22c0f9dabf01bf21d",
            "path": "package.json"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-7+4qpjCbXZPlQZziYCRF65GYW6JR4QreRQsjQizlQ/mOFrAMBliR2SqWuV5BKYmN9yWg9krMVV+OlrG31mtQVQ==",
                "sha1": "0f0fdc2ec2ccdef7331cc149c6272cf715d03f12"
            },
            "filename": "chai-as-uphelded-6.11.4.tgz"
        }
    ]
}