MalwarePublished 29 Jul 2026Updated 14 Aug 2026

@finxsecdemo/utils (npm) · Malicious Code

Affects @finxsecdemo/utilsSource GCVE Database

Malicious package : remove @finxsecdemo/utils and rotate any secrets on hosts that installed it.

Data as of 15 Aug 2026, 05:26 UTC

Classification

Malicious package

Published to npm · OSV MAL-2026-11170

What to do

Remove @finxsecdemo/utils 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
npm@finxsecdemo/utils	Affected =1.0.2 =1.0.3	Fixed in–

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Description

The npm package '@finxsecdemo/utils' versions 1.0.2 and 1.0.3 contain malicious code that executes during installation. The postinstall.js script performs an HTTPS GET request and DNS resolution to a hardcoded external domain, sending system information such as hostname, user info, and environment variables. This behavior effectively leaks the installer's source IP and DNS resolver IP to an attacker-controlled server. Additionally, the package's main function returns corrupted output that can disrupt consumers displaying formatted currency. This malicious activity occurs regardless of the package's labeling as a 'dependency confusion PoC.'

Impact

This malicious package leaks sensitive system information and network details to an attacker-controlled domain during installation, potentially exposing the installer's environment and network topology. It also corrupts output in dependent applications that display formatted currency, which may cause functional or data integrity issues. There is no indication of active exploitation in the wild at this time.

Defensive guidance

Users should avoid installing versions 1.0.2 and 1.0.3 of '@finxsecdemo/utils'. If these versions are present, remove the package and replace it with a trusted alternative. Monitor for updates from the package maintainer or npm registry for any official fixes or advisories. Since this is not a cloud service, remediation depends on user action.

Summary

The '@finxsecdemo/utils' npm package versions 1.0.2 and 1.0.3 include a postinstall.js lifecycle script that unconditionally contacts a hardcoded OAST domain on every installation. It collects and transmits system information including os.hostname(), os.userInfo(), and process.env to the attacker's server, leaking the installer's IP and DNS resolver IP. The package's main export returns a string that corrupts formatted currency output, impacting any dependent software that uses it. The network callback and output corruption happen regardless of the package's console message claiming it is a 'dependency confusion PoC.' The OpenSSF Package Analysis project has identified this package as malicious due to its communication with a domain associated with malicious activity.

References

Community reviews

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What to do

Affected software

Description

AI analysisMachine-generated, updated 15 Aug 2026, 05:26 UTC

Technical details

References

Community reviews