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npm · Malicious package advisory

Malware

lint-perseus-css-minimizer-webpack-plugin-cygnus

GHSA-q53x-hqp6-gmjm

Malicious code in lint-perseus-css-minimizer-webpack-plugin-cygnus (npm)

Details

**Severity:** Critical

**Affected versions:** `> 0`

The package lint-perseus-css-minimizer-webpack-plugin-cygnus was found to contain malicious code.

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Credit: [OpenSSF](https://github.com/ossf/malicious-packages) ([source](https://github.com/ossf/malicious-packages/blob/934165475d54679a7cd445f025bb8c97422cc949/osv/malicious/npm/lint-perseus-css-minimizer-webpack-plugin-cygnus/MAL-2025-25407.json))

**References:**
- https://github.com/ossf/malicious-packages/blob/934165475d54679a7cd445f025bb8c97422cc949/osv/malicious/npm/lint-perseus-css-minimizer-webpack-plugin-cygnus/MAL-2025-25407.json
- https://github.com/advisories/GHSA-q53x-hqp6-gmjm

Compromised versions (1)

  • > 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.