Malicious code in css-nrmgzn-polyfill (npm)
--- _-= 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.
MAL-2026-17576
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-2026-17576
css-nrmgzn-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-nrmgzn-polyfill",
"purl": "pkg:npm/css-nrmgzn-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-nrmgzn-polyfill/MAL-2026-17576.json",
"indicators": {
"evidence_files": [
{
"path": "thunderboltRegistry.js",
"tlsh": "b47153a5b99df02166c33438cb7f5049b4bbc6672c6caee0740899b02f7985c01be6f5",
"sha256": "eea1ba8ba61d690d808a52ef7fec1a4115e5f322572c5c6241a6dfbcc3223abe"
}
],
"package_integrity": [
{
"hashes": {
"sha1": "e672b68052edc0e4b805f50f161b117b0d5b17eb",
"sha512_sri": "sha512-KhcltUjoZ8S9Hug8iBW4VHTRycfAUbm4sVOT0aZ9zVBmX9EGxYbb0K4ER52nkhKlty5E3E+8VNNNEJNpP+Kjqg=="
},
"filename": "css-nrmgzn-polyfill-1.0.0.tgz"
}
]
}
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #84299 · Revision 1
- Added to Heist Feed
- Publisher date