Hyperbridge revises exploit losses to $2.5M, 10x initial $237K estimate after Token Gateway hack

Hyperbridge, a Polkadot-based cross-chain protocol, has dramatically revised its exploit losses upward to $2.5 million from an initial estimate of $237,000—a tenfold increase that highlights the challenge of assessing smart contract breaches in real-time. The exploit targeted the protocol's Token Gateway on Ethereum.

The attack exploited a smart contract vulnerability in Hyperbridge's Token Gateway infrastructure, allowing the attacker to drain significantly more funds than initially detected. The protocol's team has traced portions of the stolen funds to cryptocurrency exchange Binance, suggesting potential recovery efforts or investigation cooperation.

The massive discrepancy between initial and revised loss estimates reveals the complexity of cross-chain protocols and the difficulty in immediately assessing breach scope. Hyperbridge operates as a bridge connecting Polkadot to other blockchains, making it a high-value target for exploiters seeking to manipulate cross-chain asset transfers.

Cross-chain bridge protocols continue to represent major attack vectors in DeFi, with this incident adding to a growing list of multi-million dollar exploits targeting interoperability infrastructure. Traders should monitor whether Hyperbridge can recover traced funds and implement security upgrades before resuming operations.