Polymarket Trap npm Self-Upgrade: node.exe Overwriting node_modules Post-Install

Ibrahim Saud@tektrix

•updated Jun 30, 2026•0•0•0

Detects malicious npm package behavior where a package uses 'npm pack' and associated script files (e.g., sync-peer.cjs) to download and overwrite its own installed files. This technique is often used in software supply chain attacks to bypass static analysis of the original package tarball by fetching a second, malicious version at runtime.