solidity-cat

GHSA-93r8-wfvq-vpvg

Malicious code in solidity-cat (npm)

Details

**Severity:** Critical

**Affected versions:** `= 2.0.1`

solidity-cat ships index.js, which is byte-identical to the hardhat-hold payload: an obfuscator.io-style loader built on execSync and axios that fetches and runs a second stage. It is a new name for the hardhat-hold (MAL-2026-14246) campaign; the file hashes below match that record's evidence. The package presents itself as an ordinary utility, so the code runs on import or install without the user knowing.

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Credit: [OpenSSF](https://github.com/ossf/malicious-packages) ([source](https://github.com/ossf/malicious-packages/blob/23ba843b4a773277fa7a4a51240e83cd70ea2a45/osv/malicious/npm/solidity-cat/MAL-2026-18694.json))

**References:**
- https://github.com/ossf/malicious-packages/blob/23ba843b4a773277fa7a4a51240e83cd70ea2a45/osv/malicious/npm/solidity-cat/MAL-2026-18694.json
- https://osv.dev/vulnerability/MAL-2026-14246
- https://www.npmjs.com/package/solidity-cat
- https://github.com/advisories/GHSA-93r8-wfvq-vpvg

Compromised versions (1)

= 2.0.1

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