npm · Malicious package advisory
Malwarecss-logical-prop-shim
MAL-2026-17482
Malicious code in css-logical-prop-shim (npm)
Details
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## Source: amazon-inspector (d0ffba65f80ee8f200199c8c90ebb6297b8590537c80ea50bb34874d91665b5f)
The package ships thunderboltRegistry.js which imports child_process and invokes execSync with curl commands at multiple sites (lines 30, 39, 47, 48). The declared purpose of the package is a CSS logical-property shim, which has no legitimate need to spawn shells or make outbound curl requests. The co-location of child_process + repeated execSync('curl...') calls in a package whose stated purpose is a frontend CSS polyfill is the shape of a dropper or exfiltration helper rather than library code, and the file name 'thunderboltRegistry' is unrelated to any CSS functionality.
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.