Arbitrum Bridge Rated 7/10 Risk as $3.28B TVL Faces Centralisation Concerns

A DeFi security audit dated September 13, 2026, assessed the Arbitrum Bridge, which currently holds approximately $3.28 billion in total value locked, representing around 12% of all assets on the Arbitrum network. The report flagged significant centralisation risks, noting that four of the seven validators on the committee are owned by the same parent company, raising concerns about potential collusion. Over 80% of the bridge's liquidity is concentrated among a small number of whale addresses and a single Uniswap V3 pool, amplifying systemic risk if major participants exit. Additional vulnerabilities include a seven-day fraud-proof window that could be exploited before a challenge is mounted, an upgradeable contract governed by a multi-sig with overlapping control, and the absence of any liquidity insurance mechanism. The overall risk profile was rated moderate-high at 7 out of 10, with auditors warning that adversarial conditions could result in substantial user fund losses.