MAL-2026-17479

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/css-gap-decorations-polyfill/MAL-2026-17479.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-17479
Published
2026-10-04T23:13:45Z
Modified
2026-10-04T23:30:05Z
Summary
Malicious code in css-gap-decorations-polyfill (npm)
Details

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

Source: amazon-inspector (8126656cc344a4f632b8ddf5a23683fc92ac22798bb67e1aed6bca73ac82d7b6)

The package is published as a CSS polyfill but ships no polyfill functionality. On require(), thunderboltRegistry.js uses child_process.execSync to run whoami, uname -a, ifconfig/ip addr, and read /etc/hosts, then sends each result along with a beacon (node version, platform, pid) as query parameters to the hardcoded attacker-controlled endpoint http://dxpoc.gt.tc/callback.php/ef9ea0e191006f3cc6670720c99c26f3. The package exposes stub factories under internal-sounding names (thunderboltRegistry, siteAssetsRegistry, documentManagementRegistry, editorRegistry, corvidRegistry, and others) and bundles a registry-manifest.min.json mapping them all to a single parastorage.com asset, consistent with a dependency-confusion attack targeting a private Wix/Thunderbolt package namespace. Installer harm: host identity, kernel version, network configuration, and /etc/hosts contents are exfiltrated to an attacker-controlled host simply by resolving and loading the package.

Database specific 
{
    "malicious-packages-origins":  [
        {
            "id":  "IN-MAL-2026-020883",
            "import_time":  "2026-10-04T23:16:30.249880321Z",
            "modified_time":  "2026-10-04T23:13:45Z",
            "sha256":  "8126656cc344a4f632b8ddf5a23683fc92ac22798bb67e1aed6bca73ac82d7b6",
            "source":  "amazon-inspector",
            "versions":  [
                "1.0.0"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / css-gap-decorations-polyfill

Package

Name
css-gap-decorations-polyfill
View open source insights on deps.dev
Purl
pkg:npm/css-gap-decorations-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":  "72cefe23c4ceb63af7f6e0031306415507928009c3859e3b5d7e6ce178987b02",
            "tlsh":  "376134a5b99df02166c33438cfbf404aa4bb85632d6caed0b44899f02f7985c01ba5f5"
        }
    ],
    "package_integrity":  [
        {
            "filename":  "css-gap-decorations-polyfill-1.0.0.tgz",
            "hashes":  {
                "sha1":  "81174410ccd2113df991af35355768d7c3d5c579",
                "sha512_sri":  "sha512-xyqDWEoLBggdkDhgdeZVsxMfHFSY0lAEZ26h9mFJgirrCZ8bpBOFNMUbZNHd6diIucW8tEBC+qkomK7ABTj/9A=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/css-gap-decorations-polyfill/MAL-2026-17479.json"