Malicious code in cat-sis2go-utils (npm)
The npm package cat-sis2go-utils versions 99.0.0 and 99.1.0 contain malicious lifecycle scripts that execute during installation. These scripts perform a DNS lookup and send a JSON beacon with the installer's hostname and process context to an external server controlled by the attacker. The package is identified as a dependency-confusion proof of concept and enables arbitrary code execution on the host machine, resulting in machine fingerprinting by a third party.
AI Analysis
Technical Summary
The cat-sis2go-utils npm package versions 99.0.0 and 99.1.0 include both preinstall and postinstall lifecycle hooks that run scripts/run.js on every npm install. This script unconditionally performs a DNS lookup against a domain controlled by the attacker and sends a JSON payload containing the installer's hostname and process context to an external webhook URL. The package description indicates it is a dependency-confusion proof of concept, and the versioning suggests it is a squatted package intended to resolve in place of an internal package. Installing this package results in arbitrary code execution on the installer host and allows the attacker to fingerprint the machine remotely.
Potential Impact
Installing the affected versions of cat-sis2go-utils leads to arbitrary code execution on the installer's machine. This enables the attacker to collect sensitive environment information such as hostname and process context, potentially facilitating further attacks or reconnaissance. The malicious behavior occurs silently during installation, posing a risk to any system where the package is installed.
Mitigation Recommendations
No official patch or remediation is currently documented. Avoid installing cat-sis2go-utils versions 99.0.0 and 99.1.0. Verify package authenticity before installation and audit dependencies for suspicious lifecycle scripts. Consider removing the package if already installed and monitor for unexpected network activity related to the described domains. Patch status is not yet confirmed — check the vendor advisory or trusted sources for updates.
Malicious code in cat-sis2go-utils (npm)
Description
The npm package cat-sis2go-utils versions 99.0.0 and 99.1.0 contain malicious lifecycle scripts that execute during installation. These scripts perform a DNS lookup and send a JSON beacon with the installer's hostname and process context to an external server controlled by the attacker. The package is identified as a dependency-confusion proof of concept and enables arbitrary code execution on the host machine, resulting in machine fingerprinting by a third party.
Affected software
Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The cat-sis2go-utils npm package versions 99.0.0 and 99.1.0 include both preinstall and postinstall lifecycle hooks that run scripts/run.js on every npm install. This script unconditionally performs a DNS lookup against a domain controlled by the attacker and sends a JSON payload containing the installer's hostname and process context to an external webhook URL. The package description indicates it is a dependency-confusion proof of concept, and the versioning suggests it is a squatted package intended to resolve in place of an internal package. Installing this package results in arbitrary code execution on the installer host and allows the attacker to fingerprint the machine remotely.
Potential Impact
Installing the affected versions of cat-sis2go-utils leads to arbitrary code execution on the installer's machine. This enables the attacker to collect sensitive environment information such as hostname and process context, potentially facilitating further attacks or reconnaissance. The malicious behavior occurs silently during installation, posing a risk to any system where the package is installed.
Mitigation Recommendations
No official patch or remediation is currently documented. Avoid installing cat-sis2go-utils versions 99.0.0 and 99.1.0. Verify package authenticity before installation and audit dependencies for suspicious lifecycle scripts. Consider removing the package if already installed and monitor for unexpected network activity related to the described domains. Patch status is not yet confirmed — check the vendor advisory or trusted sources for updates.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- MAL-2026-16071
- Osv Schema Version
- 1.7.4
- Aliases
- []
- Ecosystems
- ["npm"]
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6aa15f82acd9273b496184cc
Added to database: 09/09/2026, 13:30:42 UTC
Last enriched: 09/09/2026, 13:59:40 UTC
Last updated: 09/09/2026, 20:17:56 UTC
Views: 3
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.