Sunday, June 21, 2026

Taiko

Funds lost

$1.7M

Attack type

Other

Network

Ethereum

Category

Bridge

Summary

In 21st June 2026, the Ethereum Layer-2 rollup protocol Taiko suffered a bridge exploit targeting its ERC20Vault contract, resulting in a loss of approximately $1.7 million.

Details of the Exploit

The exploit was driven by a critical flaw within Taiko’s cross-chain message and chain state verification architecture. The system incorrectly validated L2 signal data on Ethereum Layer 1, allowing forged message proofs to be accepted as legitimate without a matching event occurring on the source chain. The attacker leveraged this verification flaw to register and submit fraudulent bridge messages directly to the L1 contract infrastructure.

Because the validation layer failed to cross-examine the source-chain state records correctly, the system authenticated the malicious payloads as valid token withdrawals. This logic gap permitted the unauthorized extraction of accumulated assets, including ETH, USDC, and native TAIKO tokens, directly out of the protocol's main ERC20Vault. The team rapidly intervened by stopping block production, pausing withdrawals through the L1 Bridge, and coordinating with centralized exchanges to freeze the stolen assets.

Source: De.Fi REKT Database. Data as of November 9, 2026.