Crypto Bridges Make Blockchains More Connected, but the Risks Remain

The expansion of the blockchain ecosystem toward a multi-chain environment has generated a growing demand for infrastructure that enables the transfer of assets and information between heterogeneous networks. Cross-chain bridges have consolidated as the predominant solution for this interoperability need.

However, the history of security incidents associated with this category of protocols reveals a structural contradiction: the very architecture that enables connectivity introduces attack vectors that monolithic systems do not present.

According to DefiLlama, in 2026 there have been 250 attacks on DeFi protocols, with approximate losses of $1.4 billion. This figure, while significant, represents a reduction compared to the $2.7 billion lost in 146 incidents during 2025. What is particularly revealing is the concentration of value in attacks directed at bridges: between February and May 2026, at least eight relevant security incidents occurred against this type of infrastructure, with a total stolen amount of $328.6 million. This figure does not include later attacks, such as the one in July against Allbridge Core.

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