MAL-2026-12649

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/clients-structure/MAL-2026-12649.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12649
Published
2026-08-05T14:00:13Z
Modified
2026-08-05T14:36:07.154164789Z
Summary
Malicious code in clients-structure (npm)
Details

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

Source: amazon-inspector (5dc3674a31787baaf2d3d554336f507ecce91da7b4d527a170c50cd720024d48)

On require() of clients-structure, index.js loads ext.js which selects a platform-specific endpoint, fetches a binary from a rotating list of anonymous Cloudflare Workers subdomains (oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf103-070.workers.dev), with a DNS-TXT fallback channel over sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru that reconstructs a base64 payload chunked across numbered TXT records. The fetched bytes are written to a temp path, chmod 0755, and spawned detached via /bin/sh -c or cmd.exe. Destination hostnames are assembled at runtime from split string fragments joined via Array.join, and a /tmp/.analyticsstate TTL marker plus an opt-out env-var facade serve as cover story. No hash or signature verification is performed, and the destinations bear no relation to any declared publisher.

Database specific 
{
    "malicious-packages-origins": [
        {
            "modified_time": "2026-08-05T14:00:13Z",
            "source": "amazon-inspector",
            "sha256": "5dc3674a31787baaf2d3d554336f507ecce91da7b4d527a170c50cd720024d48",
            "import_time": "2026-08-05T14:20:04.624307044Z",
            "id": "IN-MAL-2026-015125",
            "versions": [
                "35.9.8"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / clients-structure

Package

Name
clients-structure
View open source insights on deps.dev
Purl
pkg:npm/clients-structure

Affected ranges

Affected versions

35.*
35.9.8

Database specific

indicators 
{
    "package_integrity": [
        {
            "filename": "clients-structure-35.9.8.tgz",
            "hashes": {
                "sha512_sri": "sha512-EMMtqevESaXvV0/uSJTgEFffR/z79HL8munzAonVcL3o36YP2Q+/fa2TMy9OOASi4D2haYkLDkta7FNMJYuZ3g==",
                "sha1": "1bdb00708d7b30197e0aaabc572bedceb4354aef"
            }
        }
    ],
    "evidence_files": [
        {
            "tlsh": "40a1a69a02a970188bb0e7e4c7179825f61af663378082c4fb5c65944fb71248371dfc",
            "sha256": "2d89112237ab104562891445319cbfb3f0f6aef81534ea1f46e0327bec343899",
            "path": "_ext.js"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/clients-structure/MAL-2026-12649.json"
cwes 
[
    {
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506"
    }
]