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Taiko Ethereum Layer 2 Network Halts After $1.7M Bridge Exploit

Taiko Ethereum Layer 2 Network Halts After $1.7M Bridge Exploit

First seen 22 Jun 2026, 06:36 UTC • •
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ThreatCluster AI
ThreatCluster •June 23, 2026 at 05:59 UTC
  • •Taiko halted block production after a $1.7 million exploit of its bridge mechanism.
  • •The attacker forged withdrawal requests due to a flaw in message-proof verification.
  • •Taiko has advised users to withdraw funds and suspended token deposits on exchanges.

Taiko, an Ethereum Layer 2 rollup, has halted block production following a security breach affecting its bridge mechanism. An attacker exploited a flaw in the bridge's message-proof verification, allowing them to forge withdrawal requests without legitimate deposits. The estimated losses amount to $1.7 million, with 1.99 million Taiko tokens transferred to the MEXC exchange. Taiko has urged users to withdraw funds from all bridges and requested centralized exchanges to suspend deposits of its native token. The incident was initially reported by Blockaid, which identified the root cause as an exposed signing key on GitHub. The team is coordinating with its Security Council and ecosystem partners to contain the incident and prepare a post-mortem report. The breach highlights vulnerabilities in cross-chain bridges, which have been targeted in multiple exploits this year.

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Timeline

2026-06-22
Taiko confirms exploit and halts block production
Taiko announced a compromise of its chain state verification mechanism, urging users to withdraw funds immediately.
Theblock.Co
2026-06-22
Estimated losses reported at $1.7 million
The exploit allowed the attacker to drain funds from the bridge and token vault, with losses confirmed by Taiko and PeckShield.
Cryptonews
2026-06-22
Exposed signing key identified as root cause
Security firm BlockSec traced the exploit to a publicly accessible signing key for Raiko on GitHub.
Cryptonews
2026-06-22
Immediate withdrawal urged from all bridges
Taiko requested users to withdraw funds from all bridges and asked exchanges to suspend TAIKO deposits.
Cryptobriefing
2026-06-22
Taiko's response efforts initiated
The team is coordinating with the Security Council and ecosystem partners to contain the incident and assess damages.
Cryptopotato

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