Crypto Hacks Accounted $75.9M Worth of Losses in June, Humanity Protocol Attack Tops List

TL;DR

• The industry lost $75.87 million across 40 major crypto hacks in June, down 7.13% from May.
• Humanity Protocol suffered the largest exploit of the month, with losses totaling $31 million.
• PeckShield found that the Humanity Protocol attacker laundered stolen funds across multiple blockchain networks.
• Private key compromises continue to drive a significant share of crypto theft despite secure blockchain infrastructure.

The cryptocurrency sector lost $75.87 million to 40 major security breaches in June 2026, marking a 7.13% decline from the $81.7 million stolen in May, according to blockchain security firm PeckShield. Although total losses eased month over month, attackers continued to target decentralized finance (DeFi) platforms, bridges, and protocols, with the Humanity Protocol exploit accounting for the largest single incident.

PeckShield reported that the Humanity Protocol hack resulted in approximately $31 million in losses, followed by the Syscoin Bridge exploit at $10 million and the JaredFromSubway.eth MEV bot incident, which caused $7.5 million in damages. Other notable attacks affected Secret Network, Polymarket users, SecondFi, TESSERA, Aztec Bridge, Aztec Connect, Taiko Bridge, Token of Power, Raydium, and LABUBU/OLPC.

The security firm also revealed that the Humanity Protocol exploiter has actively laundered stolen assets across multiple blockchain networks, including Bitcoin, Solana, Hyperliquid, and BNB Chain.

Humanity Protocol Exploiter Linked to Multiple Blockchain Networks

According to PeckShield, investigators observed the Humanity Protocol attacker moving stolen funds across several blockchain ecosystems in an apparent effort to obscure their origin. The firm added that the laundered assets were commingled with funds associated with the KelpDAO exploit, suggesting a possible connection between the actors behind the two incidents.

June also saw both Aztec Bridge and Aztec Connect targeted in separate attacks during the same month. Together, the two exploits resulted in roughly $4 million in losses, adding to a growing list of bridge-related security incidents.

While June’s total losses were lower than those recorded in May, the number of major attacks highlights the continued security challenges facing the crypto industry.

Private Key Compromises Remain a Major Security Threat

The latest wave of attacks comes as industry data continues to show that compromised private keys remain one of the leading causes of crypto-related theft. According to DeFiLlama data, blockchain projects have collectively lost $16.69 billion to hacks, bridge exploits, and other security incidents over the years, with roughly 40% of those losses linked to stolen or compromised private keys rather than flaws in blockchain infrastructure or smart contracts.

Hack Data | Source: DeFiLlama

Private keys function as the credentials that grant access to cryptocurrency wallets and digital assets. As a result, attackers who obtain these keys can gain control of funds even when the underlying blockchain technology remains secure.

The June figures underscore that while overall monthly losses declined, security threats continue to evolve as attackers increasingly exploit operational weaknesses and move stolen assets across multiple blockchain networks in an effort to complicate recovery efforts.

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