Key Takeaways
- An exploit on Taiko’s Ethereum layer-2 bridge resulted in the theft of approximately $1.7 million in digital assets.
- A vulnerability in the bridge’s signal proof validation system enabled attackers to create fraudulent messages.
- Hackers leveraged counterfeit proofs to extract assets from the ERC20 vault without corresponding legitimate transactions on Taiko’s network.
- Nearly 2 million Taiko tokens were transferred to MEXC exchange by the attacker; approximately $1.5 million in mostly Ether remains in malicious wallets.
- The project has suspended block production, disabled compromised systems, and issued urgent withdrawal notices to all bridge users.
On Monday, Ethereum layer-2 network Taiko disclosed a security compromise that enabled malicious actors to siphon approximately $1.7 million from its bridging infrastructure. The development team has suspended block production and issued emergency guidance for users to immediately withdraw their assets.
Details of the Security Breach
The vulnerability was found in Taiko’s chain state verification infrastructure. Blockchain security company Blockaid traced the problem to deficiencies in how the Taiko bridge authenticated source signals.
The issue allowed maliciously constructed message proofs to pass validation on Ethereum’s base layer despite having no corresponding legitimate events on the Taiko network. This enabled the perpetrator to submit fake bridge messages and extract funds from the ERC20 vault without proper authorization.
Blockaid’s preliminary assessment estimated losses near $1 million. Subsequent investigations by PeckShield and Lookonchain revised the total to roughly $1.7 million.
The malicious actor moved 1.99 million Taiko tokens—valued between $170,000 and $189,000 based on market conditions—to the MEXC centralized exchange. According to blockchain analytics platform Arkham, approximately $1.5 million remains under the attacker’s control across multiple wallets, predominantly in Ether.
Official Response from Taiko
Taiko issued a statement on X acknowledging the security incident and confirming collaboration with its Security Council and ecosystem stakeholders to mitigate further damage. The organization has disabled affected infrastructure components and stopped all block proposers from generating new blocks pending completion of the security audit.
Taiko additionally requested that centralized exchanges temporarily halt deposits of its native token.
“The security assumptions of all bridges deployed on Taiko can no longer be relied upon,” the organization stated, emphasizing the critical need for all users to immediately withdraw bridge funds.
Taiko operates as a based rollup, which means it depends on Ethereum validators for transaction sequencing. The network went live on mainnet in May 2024.
June’s Growing List of Crypto Exploits
This incident joins a concerning series of at least 23 cryptocurrency security breaches documented in June 2026, per DeFiLlama data.
The most significant exploit this month targeted Humanity Protocol, resulting in losses exceeding $30 million. Syscoin Bridge suffered damages surpassing $8 million. Secret Network was compromised just days ago for $4.67 million via an infinite mint vulnerability. Additionally, a PancakeSwap liquidity pool was drained of approximately $1.1 million over the previous weekend.
Taiko’s native token is presently valued at $0.084, representing a 98% decline from its 2024 all-time high.
