MalwarePublished 24 Jul 2026Updated 23 Sep 2026

subapp-pkg-util (npm) · Malicious Code

Affects subapp-pkg-utilSource GCVE Database

Malicious package : remove subapp-pkg-util and rotate any secrets on hosts that installed it.

Data as of 23 Sep 2026, 06:22 UTC

Classification

Malicious package

Published to npm · OSV MAL-2026-11045

What to do

Remove subapp-pkg-util 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
npmsubapp-pkg-util	Affected =99.0.1 =99.0.0	Fixed in–

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Description

The npm package 'subapp-pkg-util' versions 99.0.0 and 99.0.1 contains malicious code that executes automatically upon installation. It collects detailed host information including OS details, user info, public IP, and geolocation data, then sends this data to a hardcoded external domain associated with malicious activity. The package is identified as a dependency-confusion proof-of-concept but acts as malware by compromising the host system. Removal of the package does not guarantee full remediation due to potential further compromise.

Impact

Any system with this package installed should be considered fully compromised. The attacker gains access to sensitive host information and potentially full control of the system. All secrets and keys stored on the compromised system should be rotated immediately from a secure, unaffected environment. Simply removing the package does not guarantee removal of all malicious artifacts or backdoors.

Defensive guidance

Remove the 'subapp-pkg-util' package immediately if installed. Rotate all secrets and keys that may have been exposed from a different, secure system. Conduct a thorough investigation and remediation of the affected host as full compromise is likely.

Summary

The 'subapp-pkg-util' npm package versions 99.0.0 and 99.0.1 includes a postinstall hook that runs a script collecting host identifiers (os.hostname(), os.userInfo(), os.platform(), OS release) and enriches this data with public IP and geo/ISP information via external APIs. This data is then POSTed to a hardcoded Burp Collaborator subdomain at oastify.com, indicating command and control communication. The package is flagged as malicious by multiple sources including Amazon Inspector, GHSA malware database, and OpenSSF Package Analysis. It is described as a dependency-confusion takeover proof-of-concept but effectively compromises any system on which it is installed.

References

Community reviews

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What to do

Affected software

Description

AI analysisMachine-generated, updated 23 Sep 2026, 06:22 UTC

Technical details

References

Community reviews