MalwarePublished 13 Nov 2026

superlib_ex3 (npm) · Malicious Code

Affects superlib_ex3Source GCVE Database

Malicious package : remove superlib_ex3 and rotate any secrets on hosts that installed it.

Data as of 13 Nov 2026, 05:28 UTC

Classification

Malicious package

Published to npm · OSV MAL-2026-19149

What to do

Remove superlib_ex3 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
npmsuperlib_ex3`pkg:npm/superlib_ex3`Other threats	Affected =1.0.0 =1.0.1	Fixed in–

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Description

The npm package 'superlib_ex3' is a malicious package that acts as a multi-stage loader. Upon installation, it fetches and executes a second-stage payload from an attacker-controlled host via an unverified network request. The package has no legitimate functionality, and all published versions are malicious.

Impact

Installation of 'superlib_ex3' results in execution of attacker-controlled code on the installer's machine, potentially leading to full compromise of the environment where the package is installed. The lack of integrity checks on the fetched payload allows the attacker to modify the payload at will, increasing the risk of arbitrary code execution and persistence.

Defensive guidance

Users should immediately remove 'superlib_ex3' from their dependencies and avoid installing it. Since no legitimate functionality exists and all versions are malicious, no safe version is available. Employing strict package vetting and using trusted sources for dependencies can help prevent similar threats.

Summary

The 'superlib_ex3' npm package masquerades as a simple hello-world library but contains a malicious postinstall lifecycle hook. This hook unconditionally fetches a shell script from a hardcoded attacker-controlled URL and writes it to the installer's current directory without any integrity verification. The fetched script can be changed at any time by the attacker, enabling arbitrary code execution during installation. There is no legitimate reason for this network activity or script staging, indicating the package is designed solely for malicious purposes. Both known published versions (=1.0.0 and =1.0.1) are affected.

References

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What to do

Affected software

Description

AI analysisMachine-generated, updated 13 Nov 2026, 05:28 UTC

Technical details

References

Community reviews