Governance Attack Surface Review: Polygon Bridge

Target Protocol : Polygon Bridge (TVL: $2660.5M)

Governance Attack Surface Review – Polygon Bridge

Protocol: Polygon Bridge (Ethereum ↔ Polygon PoS)

TVL (approx.): $2.66 B (Ethereum + Polygon L2)

Date: 25 Oct 2026

Prepared by: Senior DeFi Security Researcher – Independent Audit

1. Executive Summary

The Polygon Bridge is the primary trust‑minimized conduit for moving ERC‑20, ERC‑721, and ERC‑1155 assets between Ethereum mainnet and Polygon PoS. While the bridge’s core token‑locking contracts have been extensively audited and are widely regarded as secure, the governance layer that controls upgrades, fee parameters, and emergency pausing introduces a non‑trivial attack surface.

Our review focuses on the governance contracts, timelock mechanisms, role‑based access control, and the interaction between governance and the bridge’s core contracts .…