Malicious code in css-gvqmfn-polyfill (npm)
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (ffb3f332a818748252e49dcf21ffb6949c531afd401ee697cc08ba00a067ae30) css-gvqmfn-polyfill mimics Wix internal @wix/thunderbolt-* CSS polyfill naming and ships a Proxy-based cover stub that re-exports registry names (thunderboltRegistry, siteAssetsRegistry, editorRegistry, corvidRegistry, etc.) as no-op functions to appear functional. On require of thunderboltRegistry.js, an IIFE unconditionally executes `id`, `whoami`, `uname -a`, `ifconfig`/`ip addr`, and `cat /etc/hosts` via child_process, collects os.hostname, Node version, platform, and pid, and sends the output together with an `rce-poc` beacon to the hardcoded attacker endpoint http://dxpoc.gt.tc/callback.php/bb8968d0f67000433bf7005dd5ad2d1f over plain HTTP. The accompanying registry-manifest.min.json points sibling registries to parastorage.com URLs that do not host this file, consistent with a dependency-confusion lure targeting Wix build environments.
MAL-2026-17551
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:MAL-2026-17551
css-gvqmfn-polyfill
Source reference: /affected/0/package/name
- Affected versions
- 1.0.0
Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"package": {
"name": "css-gvqmfn-polyfill",
"purl": "pkg:npm/css-gvqmfn-polyfill",
"ecosystem": "npm"
},
"versions": [
"1.0.0"
],
"database_specific": {
"cwes": [
{
"name": "Embedded Malicious Code",
"cweId": "CWE-506",
"description": "The product contains code that appears to be malicious in nature."
}
],
"source": "https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/css-gvqmfn-polyfill/MAL-2026-17551.json",
"indicators": {
"evidence_files": [
{
"path": "thunderboltRegistry.js",
"tlsh": "e87154a5b99df02065c33438cb7f4049b4bbc6672d6caee0744899b01f7985c01be6f8",
"sha256": "a485cb48081ea590cab385a405886cfe6f30af7d415f30bc8d7937ace461b928"
}
],
"package_integrity": [
{
"hashes": {
"sha1": "30f2ab1a20f691f72c8fca3449889030e47c80f4",
"sha512_sri": "sha512-gEh2j/WJZyUNAlzNFfSfSFxgB/8V5axZdaHpHnUAK+4vT6RoQDWCxfTyN9uBXJG4vTt6sL5ae6DiE254G5ViXA=="
},
"filename": "css-gvqmfn-polyfill-1.0.0.tgz"
}
]
}
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #83609 · Revision 1
- Added to Heist Feed
- Publisher date