MAL-2026-17488

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/css-starting-style-polyfill/MAL-2026-17488.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-17488
Published
2026-10-04T23:15:24Z
Modified
2026-10-04T23:30:05Z
Summary
Malicious code in css-starting-style-polyfill (npm)
Details

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

Source: amazon-inspector (713c302594ab7c41e8034ca95478045afafba98e223ea62def160f080cb879cd)

thunderboltRegistry.js runs an IIFE on module load that executes host reconnaissance commands via child_process.execSync (id, whoami, uname -a, ifconfig/ip addr, cat /etc/hosts) and transmits the collected output together with hostname, platform, and pid to a hardcoded external URL https://dxpoc.gt.tc/callback.php/bb8968d0f67000433bf7005dd5ad2d1f via fetch. The package exports factories under names matching Wix internal registry modules (thunderboltRegistry, corvidRegistry, siteAssetsRegistry, editorRegistry, documentManagementRegistry) and ships a manifest referencing parastorage.com URLs, so any environment loading it as a drop-in Wix thunderbolt registry triggers the exfiltration payload on require(). The declared CSS @starting-style polyfill purpose has no relationship to the shipped behavior.

Database specific 
{
    "malicious-packages-origins":  [
        {
            "id":  "IN-MAL-2026-020893",
            "import_time":  "2026-10-04T23:16:30.856663153Z",
            "modified_time":  "2026-10-04T23:15:24Z",
            "sha256":  "713c302594ab7c41e8034ca95478045afafba98e223ea62def160f080cb879cd",
            "source":  "amazon-inspector",
            "versions":  [
                "1.0.0"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / css-starting-style-polyfill

Package

Name
css-starting-style-polyfill
View open source insights on deps.dev
Purl
pkg:npm/css-starting-style-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":  "7dec0f17ab87d92ad6f508883b4e22a49a71f5eb68d69d67825b06e009ff6baf",
            "tlsh":  "437144a5b99df02066c33438cb7f4049b4bbd6672d6caee0740999b01f7985c01be6f8"
        }
    ],
    "package_integrity":  [
        {
            "filename":  "css-starting-style-polyfill-1.0.0.tgz",
            "hashes":  {
                "sha1":  "20fe059cb9c0e79288a4a5ce5140a96f8111b7de",
                "sha512_sri":  "sha512-uRr+IZqVaVjFM3aS4E9e1sW5FoT5SSEtkNBaFFMieApOGIfaAgmmU+JwEPw3mZrMB+D2X0Xa4qL/opt9pbLfGQ=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/css-starting-style-polyfill/MAL-2026-17488.json"