MalwarePublished 12 Aug 2026

mnchfnvbue1 (npm) · Malicious Code

Affects mnchfnvbue1Source GCVE Database

Malicious package : remove mnchfnvbue1 and rotate any secrets on hosts that installed it.

Data as of 12 Aug 2026, 16:44 UTC

Classification

Malicious package

Published to npm · OSV MAL-2026-13821

What to do

Remove mnchfnvbue1 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
npmmnchfnvbue1	Affected =1.0.0	Fixed in–

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Description

The npm package 'mnchfnvbue1' version 1.0.0 contains a tarball with a single HTML file that includes heavily obfuscated JavaScript. This script mimics a Cloudflare interstitial page and redirects browsers to a constructed URL after a short delay. The malicious code does not execute during npm install or require() because the main entry is a non-JavaScript file and no lifecycle scripts are present. This behavior indicates registry abuse to host a browser redirect rather than a direct supply-chain attack on installers. However, the presence of this package on a system is considered a full compromise, requiring immediate secret and key rotation and package removal.

Impact

The package does not execute malicious code during npm install or require(), limiting direct supply-chain impact on developers. However, if the HTML is rendered in a browser, it triggers a redirect to a potentially malicious URL. The vendor advisory warns that any system with this package installed or running should be considered fully compromised, implying that the package may be part of a broader compromise or that additional malicious activity could have occurred. Secrets and keys on affected systems should be rotated immediately. Removing the package alone may not fully remediate the compromise.

Defensive guidance

Remove the 'mnchfnvbue1' package version 1.0.0 from all systems. Immediately rotate all secrets and keys stored on affected machines from a separate, trusted system. Because the vendor advisory indicates full compromise is likely, assume additional malicious software may be present and conduct a thorough investigation. Prevent installation of this package by auditing dependencies and using package allowlists or blocklists.

References

Community reviews

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What to do

Affected software

Description

AI analysisMachine-generated, updated 12 Aug 2026, 16:44 UTC

Technical details

References

Community reviews