MAL-2026-17480

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/css-interop-observer-polyfill/MAL-2026-17480.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-17480
Published
2026-10-04T23:14:35Z
Modified
2026-10-04T23:30:05Z
Summary
Malicious code in css-interop-observer-polyfill (npm)
Details

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

Source: amazon-inspector (089bdc1dd6bdf0216bb911888e81ce97dc171bdef2588fd5de0aadb4a64fbb2b)

On module load, thunderboltRegistry.js executes an IIFE that runs id, whoami, uname, ifconfig/ip addr via child_process.execSync and reads /etc/hosts, then sends each result together with hostname, node version, platform and pid to the hardcoded endpoint http://dxpoc.gt.tc/callback.php/[token] via fetch over plain HTTP. The package presents itself as a stub exporting proxies for Wix thunderbolt internal registry names (thunderboltRegistry, siteAssetsRegistry, editorRegistry, corvidRegistry, etc.), consistent with dependency-confusion targeting of those internal module names while the load-time code performs the host reconnaissance and exfiltration.

Database specific 
{
    "malicious-packages-origins":  [
        {
            "id":  "IN-MAL-2026-020888",
            "import_time":  "2026-10-04T23:16:30.534739806Z",
            "modified_time":  "2026-10-04T23:14:35Z",
            "sha256":  "089bdc1dd6bdf0216bb911888e81ce97dc171bdef2588fd5de0aadb4a64fbb2b",
            "source":  "amazon-inspector",
            "versions":  [
                "1.0.0"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / css-interop-observer-polyfill

Package

Name
css-interop-observer-polyfill
View open source insights on deps.dev
Purl
pkg:npm/css-interop-observer-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-interop-observer-polyfill-1.0.0.tgz",
            "hashes":  {
                "sha1":  "63dead8d935e06fe33f87854159c94b69732535a",
                "sha512_sri":  "sha512-YtPFUAGh6fatFhfwC2LTA6tFw/3CjUvJnkm88PTgiWx88qPl6DitXPiRlGKd5nRdM/CoWldJUsMlU5l3APYsKQ=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/css-interop-observer-polyfill/MAL-2026-17480.json"