MAL-2026-17485

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/css-scroll-anchor-polyfill/MAL-2026-17485.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-17485
Published
2026-10-04T23:14:52Z
Modified
2026-10-04T23:30:04Z
Summary
Malicious code in css-scroll-anchor-polyfill (npm)
Details

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

Source: amazon-inspector (36596ba9b9d8c0f994abe3cd87783f4f0dc880e63d55374d3555347ce349fab2)

Package is published as css-scroll-anchor-polyfill but its index.js is empty and its contents impersonate internal Wix thunderbolt registry module names (thunderboltRegistry, siteAssetsRegistry, documentManagementRegistry, editorRegistry, corvidRegistry, and others) with a shipped registry-manifest.min.json mapping them to parastorage.com URLs. The declared purpose (a CSS scroll-anchor polyfill) is unrelated to the shipped code. thunderboltRegistry.js contains a top-level IIFE that executes on require: it runs local reconnaissance via child_process.execSync (cat /etc/hosts, whoami, id, pwd, ifconfig/ip addr, hostname, uname -a) and transmits the collected output together with a beacon (node version, process.platform, pid) via fetch to a hardcoded HTTP endpoint at http://dxpoc.gt.tc/callback.php/ef9ea0e191006f3cc6670720c99c26f3. Any internal build that resolves one of the impersonated thunderbolt names to this public package and requires the corresponding submodule triggers the reconnaissance and exfiltration path.

Database specific 
{
    "malicious-packages-origins":  [
        {
            "id":  "IN-MAL-2026-020890",
            "import_time":  "2026-10-04T23:16:30.660101652Z",
            "modified_time":  "2026-10-04T23:14:52Z",
            "sha256":  "36596ba9b9d8c0f994abe3cd87783f4f0dc880e63d55374d3555347ce349fab2",
            "source":  "amazon-inspector",
            "versions":  [
                "1.0.0"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / css-scroll-anchor-polyfill

Package

Name
css-scroll-anchor-polyfill
View open source insights on deps.dev
Purl
pkg:npm/css-scroll-anchor-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":  "52502bae08a507aee56838bd56d869c6afb9d16fecb344faf2b8a36912aba1f0",
            "tlsh":  "718130a5b99df020a6c33438cb7f504aa4bb86672c6caee0744d59b01f7985802ba5f4"
        }
    ],
    "package_integrity":  [
        {
            "filename":  "css-scroll-anchor-polyfill-1.0.0.tgz",
            "hashes":  {
                "sha1":  "f8796c49583ab0c011e8ada9a2c63a3245cd552f",
                "sha512_sri":  "sha512-ckKQkApTPEK4Thq2VMtVo36YoBRU1pgTo2GV6YKFeIJAUvoUd9hrvBrFP8/LZAj5Ietejx3zHyG6f3XaqLgZSg=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/css-scroll-anchor-polyfill/MAL-2026-17485.json"