MAL-2026-6523

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/express-plugin/MAL-2026-6523.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-6523
Published
2026-06-26T14:35:03Z
Modified
2026-06-26T15:16:36Z
Summary
Malicious code in express-plugin (npm)
Details

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

Source: amazon-inspector (183cda19ef38d3451b375669fb460577a83217091d96d7fc11d5bf33679c8003)

On module load, index.js auto-invokes initPlugin(), which HTTP-GETs https://jsonkeeper.com/b/PRA3O, parses the JSON response, and passes the response's cookie field to Function.constructor with require exposed, then immediately invokes the resulting function. Any process that does require('express-plugin') executes arbitrary JavaScript pulled from a mutable third-party paste host with full Node require privileges, giving the operator of that paste full control of the installer's machine. The file is headed as normalize-path (ES6 safe version) and exports an unused normalizePath function as decoy; the package name express-plugin is cover framing intended to make the package look like a benign Express middleware. The remote payload is attacker-mutable: today's content can be swapped for credential theft, persistence, or any other action at any time without republishing the package.

Database specific 
{
    "malicious-packages-origins":  [
        {
            "id":  "IN-MAL-2026-007607",
            "import_time":  "2026-06-26T14:59:21.375612638Z",
            "modified_time":  "2026-06-26T14:35:03Z",
            "sha256":  "183cda19ef38d3451b375669fb460577a83217091d96d7fc11d5bf33679c8003",
            "source":  "amazon-inspector",
            "versions":  [
                "1.6.6"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / express-plugin

Package

Name
express-plugin
View open source insights on deps.dev
Purl
pkg:npm/express-plugin

Affected ranges

Affected versions

1.*
1.6.6

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":  "index.js",
            "sha256":  "cb40d0001069f499b51beaba992eaf01247958017ebd217ac6421c7650828f9f",
            "tlsh":  "e641edd924fa6125c1a3e1810f8fc409b22ae1133358cac4b98c53546fe07b8a7f2f4a"
        }
    ],
    "package_integrity":  [
        {
            "filename":  "express-plugin-1.6.6.tgz",
            "hashes":  {
                "sha1":  "02dbd0ec2dcd58a51566d415265b44123e3a60db",
                "sha512_sri":  "sha512-Fu6LvzXbDNuvgjpSHNZy91mcmbER26jnB3vpFN6OcTaODQxV86D3fSBGYNXj/M44pzgB2MwXoCw7O06yf/5Kqg=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/express-plugin/MAL-2026-6523.json"