MAL-2026-17548

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/css-ayucyz-polyfill/MAL-2026-17548.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-17548
Published
2026-10-05T03:35:56Z
Modified
2026-10-05T04:15:05Z
Summary
Malicious code in css-ayucyz-polyfill (npm)
Details

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

Source: amazon-inspector (d8c7540d3981f510255434529f76a2ed9a24b0783e7e8e3369b41f71b93ebd1a)

On require, thunderboltRegistry.js runs an IIFE that acquires child_process via multiple fallbacks and executes shell commands (id, whoami, uname -a, ifconfig/ip addr, cat /etc/hosts), then GETs the collected output along with the hostname, platform and Node version to the hardcoded plain-HTTP endpoint http://dxpoc.gt.tc/callback.php/bb8968d0f67000433bf7005dd5ad2d1f. One of the beacons is self-labeled beacon=rce-poc. The package presents itself as a CSS polyfill and exposes modules named thunderboltRegistry, siteAssetsRegistry, editorRegistry and corvidRegistry — internal Wix Thunderbolt names — behind a Proxy returning no-op functions, with registry-manifest.min.json pointing fake entries at a static.parastorage.com URL, so a consumer that resolves this package in place of the real Wix internals loads the exfiltration IIFE while the facade silently returns no-ops.

Database specific 
{
    "malicious-packages-origins":  [
        {
            "id":  "IN-MAL-2026-021016",
            "import_time":  "2026-10-05T03:57:38.936079948Z",
            "modified_time":  "2026-10-05T03:35:56Z",
            "sha256":  "d8c7540d3981f510255434529f76a2ed9a24b0783e7e8e3369b41f71b93ebd1a",
            "source":  "amazon-inspector",
            "versions":  [
                "1.0.0"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / css-ayucyz-polyfill

Package

Name
css-ayucyz-polyfill
View open source insights on deps.dev
Purl
pkg:npm/css-ayucyz-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-ayucyz-polyfill-1.0.0.tgz",
            "hashes":  {
                "sha1":  "68637df5dcb71c369afd7780406885e777fc4b75",
                "sha512_sri":  "sha512-sda4giLrVE4noopYdNNqcnETeBpm5sbJYOtwkqjE2Ik3ulbGrlzSWOZ3UGFd5k3kTPyaJrGACHySUg43jL0bVA=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/css-ayucyz-polyfill/MAL-2026-17548.json"