MAL-2026-12492

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/uploader-frontend-legacy/MAL-2026-12492.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12492
Published
2026-08-05T13:06:04Z
Modified
2026-08-05T13:36:22.607611271Z
Summary
Malicious code in uploader-frontend-legacy (npm)
Details

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

Source: amazon-inspector (0e90aa99bc8b8e4bb886e911c1fe5ffbddd1d7e730088105118db47170b66681)

The package's scripts.install runs node index.js, which loads lib/core.js and issues a dns.resolve4 query against a subdomain of oob.sl4x0.xyz constructed from os.userInfo().username, os.hostname(), and process.cwd(), along with a package tag and timestamp. Module names (os, dns, process), API names (userInfo, hostname, cwd, resolve4), and the destination domain oob.sl4x0.xyz are assembled from String.fromCharCode byte arrays in lib/b02e30.js, lib/6ad264.js, and lib/core.js to hide the behavior from casual review. The net effect on npm install is an outbound DNS beacon carrying installer-identifying data to an author-controlled out-of-band listener.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "0e90aa99bc8b8e4bb886e911c1fe5ffbddd1d7e730088105118db47170b66681",
            "source": "amazon-inspector",
            "versions": [
                "9.9.11"
            ],
            "modified_time": "2026-08-05T13:06:04Z",
            "id": "IN-MAL-2026-014882",
            "import_time": "2026-08-05T13:08:52.811763286Z"
        }
    ]
}
References
Credits

Affected packages

npm / uploader-frontend-legacy

Package

Name
uploader-frontend-legacy
View open source insights on deps.dev
Purl
pkg:npm/uploader-frontend-legacy

Affected ranges

Affected versions

9.*
9.9.11

Database specific

cwes 
[
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    }
]
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/uploader-frontend-legacy/MAL-2026-12492.json"
indicators 
{
    "evidence_files": [
        {
            "path": "lib/core.js",
            "sha256": "397d1435e7291ed6b02b8627033a110124d250a54290b3a8f9f248573fd6a2d4",
            "tlsh": "38014929a393c08f97e096d0361a03d18499c380e7ce80a5fa7c4a87904e7d1cac5a96"
        },
        {
            "path": "lib/b02e30.js",
            "sha256": "89ab9421cfca8ff2f5d9a12a99453653e77ba9efe983e9019c4fe03f7b3e08ce",
            "tlsh": "3de068077307c94fa1880bf7be0090e1ba0d8b59a15dc0d6b618678500af483c1c0232"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha1": "3960dd54be464fccfedbfb4d0a9f7f88e8b15d43",
                "sha512_sri": "sha512-5wp+qqaTSrPgNTOyLSYZzsnO+CdKYRgszhLwfdwthF2bEH3nfYY/zs907z5R/tQBlw+kzKpmwSXBVkvJh+ckTw=="
            },
            "filename": "uploader-frontend-legacy-9.9.11.tgz"
        }
    ]
}