TLDR
- A security breach on Taiko’s Ethereum layer-2 bridge resulted in the theft of approximately $1.7 million in digital assets.
- The vulnerability stemmed from improper validation of source signal proofs in the bridge infrastructure, enabling fraudulent message creation.
- Malicious actors exploited fake proof submissions to withdraw assets from the ERC20 vault despite lacking legitimate transactions on Taiko’s network.
- Nearly 2 million Taiko tokens were transferred to MEXC exchange by the hacker; roughly $1.5 million in stolen funds, primarily Ether, remains in attacker-controlled addresses.
- The protocol has suspended block creation, disabled compromised components, and issued urgent warnings for users to remove all bridge deposits.
On Monday, Taiko, an Ethereum layer-2 solution, disclosed a critical security incident that enabled malicious parties to extract approximately $1.7 million through its bridge infrastructure. In response, the development team suspended block creation and issued immediate withdrawal recommendations for all users.
What Happened
The vulnerability was found in Taiko’s chain state verification architecture. Blockchain security specialist Blockaid traced the problem to inadequate validation procedures within the bridge’s source signal processing.
The attack method involved submitting fabricated message proofs that the system incorrectly authenticated on Ethereum’s base layer, despite the absence of corresponding activity on Taiko’s own blockchain. This security gap allowed unauthorized parties to create fake bridge transactions and extract tokens from the ERC20 vault without proper authorization.
Blockaid’s preliminary assessment estimated damages near $1 million. Subsequent investigations by PeckShield and Lookonchain adjusted the total to roughly $1.7 million.
The perpetrator moved 1.99 million Taiko tokens—valued between $170,000 and $189,000 based on market fluctuations—to MEXC, a centralized exchange. According to blockchain analytics provider Arkham, approximately $1.5 million worth of stolen cryptocurrency remains distributed across exploiter-controlled wallets, predominantly in Ether.
Taiko’s Response
Taiko acknowledged the security breach through a statement on X, noting active collaboration with its Security Council and ecosystem collaborators to mitigate the incident. The organization disabled affected infrastructure components and instructed all block proposers to cease generating new blocks during the ongoing analysis.
The team additionally requested that centralized trading platforms temporarily freeze deposits of the native token pending resolution.
“The security assumptions of all bridges deployed on Taiko can no longer be relied upon,” the team wrote, urging all users to withdraw bridge funds immediately.
Taiko operates as a based rollup architecture, utilizing Ethereum validators for transaction sequencing. The platform went live on mainnet in May 2024.
Part of a Broader June Pattern
This incident represents one of no fewer than 23 cryptocurrency security breaches documented throughout June 2026, based on DeFiLlama’s tracking data.
June’s most significant attack targeted Humanity Protocol, resulting in losses exceeding $30 million. Syscoin Bridge suffered damages surpassing $8 million. Secret Network experienced a $4.67 million exploit mere days prior through an infinite mint vulnerability. Additionally, a PancakeSwap liquidity pool was compromised for approximately $1.1 million during the previous weekend.
Taiko’s native token currently trades at $0.084, representing a 98% decline from its 2024 all-time high.
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