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npm · Malicious package advisory

Malware

express-cookie-parser

GHSA-4g55-qq55-m379

Malicious code in express-cookie-parser (npm)

Details

**Severity:** Critical

**Affected versions:** `> 0`

This package impersonates the popular 'cookie-parser' package. Remote code execution, persistence, self-deletion, and obfuscation found in the package's code confirm its malicious nature.

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Credit: [OpenSSF](https://github.com/ossf/malicious-packages) ([source](https://github.com/ossf/malicious-packages/blob/71b5ccd62809b0f6e173eff59b5900130cf7fc02/osv/malicious/npm/express-cookie-parser/MAL-2025-3541.json))

**References:**
- https://github.com/ossf/malicious-packages/blob/71b5ccd62809b0f6e173eff59b5900130cf7fc02/osv/malicious/npm/express-cookie-parser/MAL-2025-3541.json
- https://github.com/advisories/GHSA-4g55-qq55-m379

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.