New Cross-Chain Vulnerabilities Threaten DeFi Security Across Multiple Blockchains

Decentralized finance (DeFi) has seen a significant reduction in losses, dropping from $2.62 billion in 2022 to $534 million by 2024. However, new vulnerabilities have emerged, particularly in cross-chain deployments, where a single flaw can impact multiple networks simultaneously. The Balancer V2 exploit in November 2025 exemplified this risk, draining $128 million across six chains due to an arithmetic precision flaw. As protocols increasingly share code across Ethereum, Arbitrum, Base, Polygon, Sonic, and OP Mainnet, the potential for systemic failures has risen. Bespoke protocol logic exploits accounted for 89.1% of DeFi losses in 2025, highlighting the shift in attack vectors. Despite the overall decline in total losses, the number of unique incidents rose to 83 in 2025, indicating a growing frequency of attacks with lower individual impacts. The evolving threat landscape necessitates enhanced security measures for multi-chain protocols.

Key Points: • DeFi losses decreased from $2.62 billion in 2022 to $534 million in 2024. • New cross-chain vulnerabilities can drain funds across multiple networks simultaneously. • The Balancer V2 exploit in November 2025 drained $128 million due to a shared code flaw.