Base Bridge Rated 8/10 Risk: Critical Bugs and Governance Flaws Flagged in $3.15B Protocol

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A security assessment of Base Bridge, the primary asset-transfer gateway between Ethereum mainnet and the Base L2 rollup, has assigned it a cumulative risk score of 8 out of 10, classifying it as high risk. The bridge holds approximately $3.15 billion in total value locked, making it a high-value target for potential attackers. Researchers identified critical smart contract vulnerabilities including a re-entrancy flaw in the withdrawal function, missing input validation, and improper nonce handling that could enable replay attacks and double-spending. Governance weaknesses were also flagged, notably an upgradeable proxy contract lacking a multi-signature timelock and an admin key controlled by a single externally owned account. The assessment, prepared by a senior DeFi security researcher and dated September 30, 2026, also highlighted economic design gaps and insufficient monitoring as contributing factors to the bridge's overall systemic risk.

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