MalwarePublished 16 Jun 2026Updated 13 Jul 2026

nottuff4 (npm) · Malicious Code

Affects nottuff4Source GCVE Database

Malicious package : remove nottuff4 and rotate any secrets on hosts that installed it.

Data as of 26 Oct 2026, 15:56 UTC

Classification

Malicious package

Published to npm · OSV MAL-2026-5917

What to do

Remove nottuff4 from every project, lockfile and image that pulls it in. Treat any host that installed it as compromised: rotate the credentials, tokens and keys it could read, from a clean machine.

Affected software

Product	Affected	Fixed in
npmnottuff4	Affected =1.7.7 =1.1.7 =2.0.0	Fixed in–

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Description

The npm package 'nottuff4' version 1.7.7 contains malicious code that acts as a Scramjet-based web proxy with obfuscated JavaScript assets. When served as a website, it installs event listeners that trigger a monetized popup redirect to an external site upon user interaction. The package metadata is placeholder and suspicious, and the package does not execute malicious code during installation or import in Node.js, but only when unpacked and served to browser visitors. This behavior constitutes registry-policy abuse rather than a direct supply-chain attack on developers.

Impact

If the package is installed and then served as a website, visitors to that site will be subjected to monetized popup redirects, potentially leading to unwanted or harmful content. The package does not execute malicious code during installation or import in Node.js, so developers installing it are not directly compromised by code execution. However, any computer running this package in a serving context may be considered compromised, with potential exposure of secrets and keys. The malicious code could lead to unauthorized control over the browsing experience of website visitors.

Defensive guidance

The recommended action is to remove the 'nottuff4' package version 1.7.7 immediately from any environment. Since the package does not execute malicious code during installation but only when served as a website, avoid serving this package's contents in a web server context. Rotate all secrets and keys from a different, trusted computer if this package was ever run in a serving environment, as full compromise is possible. Monitor for and block any related throwaway sibling packages from the same author or with similar suspicious characteristics.

References

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What to do

Affected software

Description

AI analysisMachine-generated, updated 13 Jul 2026, 09:24 UTC

Technical details

References

Community reviews