Which versions of solidity-gas-watcher are malicious?

The following npm versions of solidity-gas-watcher are flagged malicious: 2.21.0. Treat any of these as compromised.

How do I remediate solidity-gas-watcher if I installed it?

Remove solidity-gas-watcher from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound activity or persistence.

I already installed solidity-gas-watcher — how do I know if it already compromised me?

If solidity-gas-watcher was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.

How do I find solidity-gas-watcher across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for solidity-gas-watcher (version 2.21.0).

Malicious package

solidity-gas-watchernpm

Advisory published Oct 26, 2026Updated Nov 5, 2026

solidity-gas-watcher is a confirmed malicious npm package (MAL-2026-18695) that executes malicious code on install (malicious version 2.21.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in solidity-gas-watcher (npm)

MAL-2026-18695

Immediate action

Remove the package, then rotate any secrets the build/runtime could reach.

npm uninstall solidity-gas-watcher

What this malware does

solidity-gas-watcher ships index.js and lib/config.js, byte-identical to the hardhat-roof and chai-foundry payloads: a pino copy whose entry point loads an obfuscated dropper. It is a new name for the hardhat-roof (MAL-2026-17509) and chai-foundry (MAL-2026-13356) 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.

Malicious versions

1 flagged

2.21.0

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for solidity-gas-watcher (version 2.21.0).
If you installed it — respond
Remove solidity-gas-watcher from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound activity or persistence.
Did it already run?
If solidity-gas-watcher was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.

Frequently asked questions

No. solidity-gas-watcher on npm has been identified as a malicious package (version 2.21.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

References

Credits

CyberXYZ · finder

Detect & block this

O3 blocks solidity-gas-watcher-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the malicious outbound activity and severs the channel.

Malware detection Runtime egress monitoring

Explore

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