MAL-2026-17576

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/css-nrmgzn-polyfill/MAL-2026-17576.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-17576
Published
2026-10-05T16:15:10Z
Modified
2026-10-05T16:31:38Z
Summary
Malicious code in css-nrmgzn-polyfill (npm)
Details

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

Source: amazon-inspector (4522148c469356aa7799c831ce547d2ae612ac40621e5110ad5d5125bf2f2684)

The package presents itself as a CSS polyfill but on require() of thunderboltRegistry.js runs an IIFE that invokes child_process.execSync for id, whoami, uname, ifconfig, and cat /etc/hosts, and sends the command output together with os.hostname(), node version, platform and pid to a hardcoded Burp Collaborator subdomain at https://unl9pgk6ei4uf80n5tf4iktspjvbuzkn9.oastify.com/. The package also exports modules named after internal Wix thunderbolt registries (thunderboltRegistry, siteAssetsRegistry, editorRegistry, corvidRegistry, documentManagementRegistry) and ships a manifest referencing static.parastorage.com paths for css-nrmgzn-polyfill, consistent with a dependency-confusion lure positioned to resolve in place of a private internal module in a Wix build or CI environment. Loading the package yields host reconnaissance exfiltration to an attacker-controlled OAST domain, with no polyfill functionality actually implemented.

Database specific 
{
    "malicious-packages-origins":  [
        {
            "id":  "IN-MAL-2026-021082",
            "import_time":  "2026-10-05T16:22:57.198924026Z",
            "modified_time":  "2026-10-05T16:15:10Z",
            "sha256":  "4522148c469356aa7799c831ce547d2ae612ac40621e5110ad5d5125bf2f2684",
            "source":  "amazon-inspector",
            "versions":  [
                "1.0.0"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / css-nrmgzn-polyfill

Package

Name
css-nrmgzn-polyfill
View open source insights on deps.dev
Purl
pkg:npm/css-nrmgzn-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":  "eea1ba8ba61d690d808a52ef7fec1a4115e5f322572c5c6241a6dfbcc3223abe",
            "tlsh":  "b47153a5b99df02166c33438cb7f5049b4bbc6672c6caee0740899b02f7985c01be6f5"
        }
    ],
    "package_integrity":  [
        {
            "filename":  "css-nrmgzn-polyfill-1.0.0.tgz",
            "hashes":  {
                "sha1":  "e672b68052edc0e4b805f50f161b117b0d5b17eb",
                "sha512_sri":  "sha512-KhcltUjoZ8S9Hug8iBW4VHTRycfAUbm4sVOT0aZ9zVBmX9EGxYbb0K4ER52nkhKlty5E3E+8VNNNEJNpP+Kjqg=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/css-nrmgzn-polyfill/MAL-2026-17576.json"