MalwarePublished 6 Aug 2026Updated 24 Sep 2026

wos-library-ui (npm) · Malicious Code

Affects wos-library-uiSource GCVE Database

Malicious package : remove wos-library-ui and rotate any secrets on hosts that installed it.

Data as of 26 Oct 2026, 16:20 UTC

Classification

Malicious package

Published to npm · OSV MAL-2026-13467

What to do

Remove wos-library-ui 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
npmwos-library-ui	Affected =99.0.0 =999.999.999	Fixed in–

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Description

The npm package wos-library-ui@99.0.0 contains malicious code that executes automatically during installation. It collects host and user information from the system and sends it to an external domain via DNS and HTTP requests. This package is a dependency confusion attack targeting an internal package name, causing unintentional data exfiltration during install. Installation of this package may lead to full system compromise.

Impact

Installation of this package leads to unconsented exfiltration of internal host and user information to an external attacker-controlled domain. The malicious code runs automatically during installation, which can result in full system compromise. All secrets and keys stored on the affected system should be considered compromised and rotated immediately. Removing the package alone may not remove all malicious artifacts or backdoors introduced.

Defensive guidance

The package should be removed immediately if installed. Systems with this package installed should be treated as fully compromised, and all secrets and keys should be rotated from a separate, trusted machine. Avoid installing packages with suspicious or unexpected preinstall scripts, especially those mimicking internal package names. Use strict dependency resolution policies to prevent dependency confusion attacks.

Summary

The npm package wos-library-ui version 99.0.0 declares a preinstall script that runs 'node poc.js' automatically on npm install. The script collects system information including hostname, username, and current working directory, then exfiltrates this data to a hardcoded Interactsh subdomain via DNS A-record lookups and HTTP POST requests. The package name and inflated version number mimic an internal package, exploiting dependency confusion to trick resolvers into downloading this malicious public package instead of the internal one. This results in unconsented disclosure of internal host identifiers and build path details to an external collector. The package self-labels as a bug bounty proof-of-concept but causes installer-side data exfiltration without consent. According to the source, any system with this package installed or running should be considered fully compromised, requiring immediate secret and key rotation from a different machine.

References

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What to do

Affected software

Description

AI analysisMachine-generated, updated 24 Sep 2026, 05:09 UTC

Technical details

References

Community reviews