Malicious code in css-kfvwax-polyfill (npm)
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (2041e61cd16558aaaeac8a2f26024866a6b949d93817f78de744c5c1781023df) On require(), thunderboltRegistry.js runs an IIFE that shells out via child_process to collect host identity (`id`, `whoami`, `uname -a`), network interface listings (`ifconfig`/`ip addr`), and the contents of `/etc/hosts`, together with the machine hostname and a beacon containing Node version, platform, and pid. The collected output is sent via fetch to the hardcoded URL https://unl9pgk6ei4uf80n5tf4iktspjvbuzkn9.oastify.com/ (Burp Collaborator OAST). The module also exports a Proxy mimicking Wix thunderbolt registry APIs (ensureComponentLoadersAreCreated, loadComponents, etc.) under namespaces such as thunderboltRegistry, siteAssetsRegistry, documentManagementRegistry, and editorRegistry, acting as a cover-story API shape consistent with a dependency-confusion or typosquat payload against Wix internal tooling. Installing or importing this package causes host reconnaissance data to be exfiltrated to attacker-controlled infrastructure.
MAL-2026-17575
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-2026-17575
css-kfvwax-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-kfvwax-polyfill",
"purl": "pkg:npm/css-kfvwax-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-kfvwax-polyfill/MAL-2026-17575.json",
"indicators": {
"evidence_files": [
{
"path": "thunderboltRegistry.js",
"tlsh": "b47153a5b99df02166c33438cb7f5049b4bbc6672c6caee0740899b02f7985c01be6f5",
"sha256": "eea1ba8ba61d690d808a52ef7fec1a4115e5f322572c5c6241a6dfbcc3223abe"
}
],
"package_integrity": [
{
"hashes": {
"sha1": "11eafd4ac50d3d8cb64cda2a17520f203c5624cc",
"sha512_sri": "sha512-lURemH1bGmfUVRgvkECW9FjDD3pPZhb7pHailTz4l15DmcEz+R8qBaKJ+cZSSs5dEgplBhX+apDEsyBLGdqDsg=="
},
"filename": "css-kfvwax-polyfill-1.0.0.tgz"
}
]
}
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #84294 · Revision 1
- Added to Heist Feed
- Publisher date