Security analysis finds Polygon Bridge carries moderate-to-high risk due to design

A senior DeFi security researcher analyzed the Polygon Bridge on October 2, 2026. The bridge, which holds over $2.8 billion in assets, facilitates transfers between Ethereum and Polygon. Its optimistic security model uses a seven-day challenge period to reduce costs but creates a significant attack surface. The analysis rated the overall risk as moderate-to-high due to past exploits and the system's complexity. Key vulnerabilities include potential validator collusion and exploitation of the challenge window.