A hacker exploited the Polkadot-based cross-chain interoperability protocol Hyperbridge, netting about $237,000 and elevating renewed safety issues about blockchain bridge infrastructure.
An attacker minted 1 billion bridged Polkadot (DOT) tokens in a single transaction on Hyperbridge, in response to blockchain data shared by cybersecurity platform CertiK. The exploit solely affected DOT on Ethereum that was bridged by Hyperbridge, whereas native DOT tokens and the broader Polkadot ecosystem stay unaffected, Polkadot famous in a Monday X post.
CertiK said the hacker managed to mint the tokens after he “slipped by a solid message to alter the admin of Polkadot token contract on Ethereum.” Restricted liquidity within the bridged DOT pool capped the proceeds at 108.2 Ether (ETH), price round $237,000.
Hyperbridge pauses operations after exploit
Hyperbridge paused operations after the assault whereas the crew labored on an improve, with contributor Web3 Thinker saying the preliminary prognosis pointed to a malicious proof that fooled the protocol’s Merkle tree verifier.
The exploit is notable as a result of Hyperbridge has marketed itself as a proof-based interoperability layer constructed to deliver “full node safety” for crosschain bridges. The incident additionally follows Aethir’s disclosure final week that it had contained a separate bridge exploit and stored person losses beneath $90,000.
Cybersecurity analysis firm Blocksec Falcon said the seemingly root explanation for the exploit was a Merkle Mountain Vary (MMR) proof replay vulnerability attributable to lacking proof-to-request binding, although the ultimate root trigger has not but been confirmed by the protocol.
The native DOT token briefly dipped to a day by day low of $1.16 on Monday, earlier than recovering to commerce above $1.19 on the time of writing, according that CoinGecko.
Hackers exploit SubQuery community for $130,000
Safety incidents proceed to hit crypto protocols regardless of a pointy year-over-year drop in DeFi exploit losses.
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On Sunday, the information indexing protocol SubQuery Community was additionally exploited for round $130,000 attributable to lacking entry management information that uncovered the code written over two years in the past.
The vulnerability enabled the attacker to set his personal contract because the withdrawal goal for staking rewards, blockchain safety auditor Pashov stated in a Sunday X post.
Hackers stole over $168 million from 34 decentralized finance (DeFi) protocols within the first quarter of 2026, marking a big decline from the $1.58 billion stolen within the first quarter of 2025, when the document $1.4 billion Bybit hack occurred.
Cointelegraph has contacted Hyperbridge for touch upon the foundation explanation for the exploit.
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