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npm · Malicious package advisory

Malware

express-yandex-host-fallback

GHSA-42v3-hc45-7q3j

Malicious code in express-yandex-host-fallback (npm)

Details

**Severity:** Critical

**Affected versions:** `> 0`

The package express-yandex-host-fallback 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/71b5ccd62809b0f6e173eff59b5900130cf7fc02/osv/malicious/npm/express-yandex-host-fallback/MAL-2025-20093.json))

**References:**
- https://github.com/ossf/malicious-packages/blob/71b5ccd62809b0f6e173eff59b5900130cf7fc02/osv/malicious/npm/express-yandex-host-fallback/MAL-2025-20093.json
- https://github.com/advisories/GHSA-42v3-hc45-7q3j

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.