---
id: "MAL-2026-18694"
kind: "package"
aliases: ["MAL-2026-18694"]
title: "Malicious code in solidity-cat (npm)"
severity: "critical"
cvss: null
epss: null
exploited: false
status: "open"
category: "package"
products: [{"name": "solidity-cat", "fixed": [], "affected": "= 2.0.1", "ecosystem": "npm"}]
ecosystems: ["npm"]
tags: ["malicious", "package"]
not_affected_if: []
published_at: "2026-10-26T00:00:00+00:00"
first_seen_at: "2026-11-05T06:31:46+00:00"
updated_at: "2026-11-05T06:32:52+00:00"
sources: [{"source": "osv-malicious", "url": "https://osv.dev/vulnerability/MAL-2026-18694", "first_seen_at": "2026-11-05T06:31:46+00:00"}]
exploit_sources: []
---

# Malicious code in solidity-cat (npm)

## Affected

- npm:solidity-cat affected = 2.0.1 fixed no fixed version listed

## Timeline

- 2026-11-05T06:31:46+00:00 osv-malicious https://osv.dev/vulnerability/MAL-2026-18694

## From the sources

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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