MAL-2026-17486

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/css-scroll-state-polyfill/MAL-2026-17486.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-17486
Published
2026-10-04T23:15:41Z
Modified
2026-10-04T23:30:04Z
Summary
Malicious code in css-scroll-state-polyfill (npm)
Details

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

Source: amazon-inspector (cffa0affc34bac3fa24fcc7c67aae4d120066f4f856cb8b637bc04c6ca9d482c)

The package presents itself as a CSS polyfill but ships a payload file (thunderboltRegistry.js) that executes an IIFE at require time. The IIFE uses child_process to run host-identification commands (id, whoami, uname -a, ifconfig/ip addr, /etc/hosts, hostname) and collects Node version, platform, and PID, then sends the captured data via fetch to a hardcoded webhook.site collector at https://webhook.site/0492a36c-4d7b-408a-865c-226db25987ba. The main index.js is an empty stub; filenames mimic internal Wix Thunderbolt registry modules, consistent with a dependency-confusion squat targeting that namespace. A self-identifying 'beacon=poc15' tag is included in the request. The payload also walks require.cache and deletes any entry whose key contains 'thunderboltRegistry', causing subsequent requires in the same process to re-execute the recon-and-exfiltration path rather than return a cached export, and exports a Proxy that answers arbitrary method accesses to blend in with the impersonated registry.

Database specific 
{
    "malicious-packages-origins":  [
        {
            "id":  "IN-MAL-2026-020895",
            "import_time":  "2026-10-04T23:16:30.95592812Z",
            "modified_time":  "2026-10-04T23:15:41Z",
            "sha256":  "cffa0affc34bac3fa24fcc7c67aae4d120066f4f856cb8b637bc04c6ca9d482c",
            "source":  "amazon-inspector",
            "versions":  [
                "1.0.0"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / css-scroll-state-polyfill

Package

Name
css-scroll-state-polyfill
View open source insights on deps.dev
Purl
pkg:npm/css-scroll-state-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":  "0f60c0bf1fdb0b33fe163dfd84fa61885547141be10240bf513a3f9801d97d92",
            "tlsh":  "4e7122a5b99df02166c33438cb7f5049f4bbd6672c6caee0b40999b01f7985c01ba6f4"
        }
    ],
    "package_integrity":  [
        {
            "filename":  "css-scroll-state-polyfill-1.0.0.tgz",
            "hashes":  {
                "sha1":  "dbebb622ac294f78bc3d26d9b4fa4e9b6aab21b0",
                "sha512_sri":  "sha512-qFbxjMfDsXdkoaYHkbdWEDFuWFLdugfYyAVFLz2jRGlgMsekQaHMFBQ5YkmWlgLHLpiNcvVzAyYfjwOTSeJCbw=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/css-scroll-state-polyfill/MAL-2026-17486.json"