MAL-2026-17550

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/css-dwsawd-polyfill/MAL-2026-17550.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-17550
Published
2026-10-05T03:35:36Z
Modified
2026-10-05T04:15:06Z
Summary
Malicious code in css-dwsawd-polyfill (npm)
Details

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

Source: amazon-inspector (1c370cda09695e44d06a44bc14d14817edadc047e4dad0314edcfc752be796e9)

The package name mimics a Wix thunderbolt polyfill and ships a registry-manifest.min.json that aliases legitimate @wix thunderbolt registry module names to thunderboltRegistry.js. On require, thunderboltRegistry.js runs an IIFE that uses child_process.execSync to execute shell reconnaissance (id, whoami, uname -a, ifconfig/ip addr, /etc/hosts) and fetches http://dxpoc.gt.tc/callback.php/bb8968d0f67000433bf7005dd5ad2d1f with the command outputs plus hostname, pid, platform, node version, and a site identifier as query parameters, tagged 'rce-poc'. A fallback path constructs a fresh Module instance to re-resolve child_process if the require cache is stubbed, ensuring execution. The destination is plain HTTP to an unrelated external host and is not caller-configurable.

Database specific 
{
    "malicious-packages-origins":  [
        {
            "id":  "IN-MAL-2026-021014",
            "import_time":  "2026-10-05T03:57:38.728986068Z",
            "modified_time":  "2026-10-05T03:35:36Z",
            "sha256":  "1c370cda09695e44d06a44bc14d14817edadc047e4dad0314edcfc752be796e9",
            "source":  "amazon-inspector",
            "versions":  [
                "1.0.0"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / css-dwsawd-polyfill

Package

Name
css-dwsawd-polyfill
View open source insights on deps.dev
Purl
pkg:npm/css-dwsawd-polyfill

Affected ranges

Affected versions

1.*
1.0.0

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":  "thunderboltRegistry.js",
            "sha256":  "a485cb48081ea590cab385a405886cfe6f30af7d415f30bc8d7937ace461b928",
            "tlsh":  "e87154a5b99df02065c33438cb7f4049b4bbc6672d6caee0744899b01f7985c01be6f8"
        }
    ],
    "package_integrity":  [
        {
            "filename":  "css-dwsawd-polyfill-1.0.0.tgz",
            "hashes":  {
                "sha1":  "ef15ad08c629a871720ac3361d4a8cb32af8a865",
                "sha512_sri":  "sha512-aD51izXwj5rI+FHut4JDVOSRAnc6akSkrOPliR6OjNLbM3UMS8iuM829TvknAlt8CGUhf+ttjzYb+bJAGLIwpw=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/css-dwsawd-polyfill/MAL-2026-17550.json"