The second quarter of 2026 has already become the most-hacked quarter on record by incident count, with 83 exploits targeting cryptocurrency protocols, according to analysis by market insights platform Unfolded based on DefiLlama data.
However, the $755.3 million stolen during the quarter so far is significantly lower than the $3.56 billion lost in the fourth quarter of 2020, which remains the costliest quarter on record for crypto hacks.
KelpDAO’s $293 million hack and Drift Protocol’s $280 million exploit were the largest incidents of the quarter.
The figures suggest hacking activity is becoming more frequent, even as total losses remain below previous record levels.
Cryptocurrency hacks by monthly sum, all-time chart. Source: DefiLlama
Bridge exploits emerged as leading attack vector in Q2 2026
Cross-chain bridge exploits emerged as the biggest attack vector of the quarter, with $351 million in value hacked from bridges alone.
The LayerZero OFT bridge exploit, which led to the $293 million KelpDAO hack, accounted for more than 38% of the value stolen during the quarter. Compromised admin attacks and fake token price manipulation accounted for 37% of losses, while private key compromises represented 5.66%.
Total hacked by technique in Q2 2026. Source: DefiLlama
Ethereum layer-2 blockchain Taiko was the latest network to suffer an exploit on one of its bridge protocols, as hackers stole $1.7 million by compromising Taiko’s chain state verification mechanism.
Other notable incidents of the past quarter include the $36 million stolen from Humanity Protocol on June 8 and the $10.7 million exploit on THORChain on May 15.
Other recent incidents include two exploits on Aztec Connect’s abandoned smart contracts, each resulting in $2.1 million stolen and $1.3 million stolen from decentralized exchange Raydium earlier in June.
The incidents add to the ongoing debate about whether the development of new artificial intelligence models has reshaped the crypto industry’s security landscape, concerns that arose from the series of exploits in April.
During a recent interview, Mitchell Amador, the CEO of bug bounty platform Immunefi, told Cointelegraph that the proliferation of new AI models has shifted the cybersecurity playing field in favor of attackers, causing a “vulnerability apocalypse” that led to the resurgence in exploits.