css-dwsawd-polyfill

Details

**Severity:** Critical

**Affected versions:** `= 1.0.0`

## Source: amazon-inspector (1c370cda09695e44d06a44bc14d14817edadc047e4dad0314edcfc752be796e9)
The package name mimics a Wix thunderbolt polyfill and ships a registry-manifest.min.json that aliases legitimate @wix thunderbolt registry module names to thunderboltRegistry.js. On require, thunderboltRegistry.js runs an IIFE that uses child_process.execSync to execute shell reconnaissance (id, whoami, uname -a, ifconfig/ip addr, /etc/hosts) and fetches http://dxpoc.gt.tc/callback.php/bb8968d0f67000433bf7005dd5ad2d1f with the command outputs plus hostname, pid, platform, node version, and a site identifier as query parameters, tagged 'rce-poc'. A fallback path constructs a fresh Module instance to re-resolve child_process if the require cache is stubbed, ensuring execution. The destination is plain HTTP to an unrelated external host and is not caller-configurable.

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Credit: [OpenSSF](https://github.com/ossf/malicious-packages) ([source](https://github.com/ossf/malicious-packages/blob/28e8e300c79177f2cb1eb131ae981c3c0e639495/osv/malicious/npm/css-dwsawd-polyfill/MAL-2026-17550.json))

**References:**
- https://github.com/ossf/malicious-packages/blob/28e8e300c79177f2cb1eb131ae981c3c0e639495/osv/malicious/npm/css-dwsawd-polyfill/MAL-2026-17550.json
- https://www.npmjs.com/package/css-dwsawd-polyfill/v/1.0.0
- https://github.com/advisories/GHSA-xvvh-qgjc-g49x

Compromised versions (1)

• = 1.0.0

Any computer that installed or ran a compromised version should be considered fully compromised. Rotate every secret on that machine from a clean environment.