June 2026 Crypto Hack Report: 45 Blockchain Security Incidents

An analysis of 45 blockchain security incidents in June 2026, highlighting $76.51 million in disclosed losses, the month’s largest hacks, attack classifications, weekly trends, and the networks and exploit techniques most frequently targeted. Across the 45 incidents recorded in June 2026, attackers walked away with exactly $76,509,341 in disclosed losses. This figure represents the sum of every numeric loss recorded in the dataset. It excludes four incidents where the loss amount was explicitly logged as “Not Disclosed,” while including two incidents where the exploit was recorded but resulted in no direct financial loss ($0). Of the 45 incidents, 38 reported a disclosed loss greater than zero. Every event in the dataset occurred between June 1 and June 30, 2026, confirming that this report covers a complete single-month period. The Costliest Hacks of the Month One incident dominated June’s threat landscape. Humanity, compromised through a private key attack affecting both Ethereum and BSC, accounted for $32,000,000 in losses alone, representing 40.5% of the month’s total disclosed losses. The second and third largest incidents, Syscoin Bridge ($8,000,000 through a fake proof exploit) and JaredFromSubway ($7,500,000), brought the combined losses of the top three incidents to $47,500,000, accounting for 60.1% of all disclosed losses during June. Top 10 Costliest Incidents Humanity – Ethereum/BSC | Infrastructure | Private Key Compromised | $32,000,000 Syscoin Bridge – Syscoin | Protocol Logic | Fake Proof Exploit | $8,000,000 JaredFromSubway – Ethereum | Other | Other | $7,500,000 Secret Network – Secret | Protocol Logic | Unbacked Mint via ICS-20 | $4,670,000 Polymarket – Polygon | Other | Other | $3,000,000 RetoSwap – Monero | Protocol Logic | ACK Frontrun Attack | $2,700,000 Aztec Bridge – Ethereum | Protocol Logic | escapeHatch Function Exploit | $2,000,000 Tessera DAO – BSC | Other | Access Control | $2,400,000 Namada Shielded Pools – Namada | Protocol Logic | IBC Transfer Logic Exploit | $600,000 Haedal Vault – Sui | Protocol Logic | Cross-Version Logic Flaw | $915,17 Top10 costliest june hacks Beyond the top five, losses declined sharply. Incidents ranked six through ten all fell within a narrow range of $600,000 to $2.7 million, while no incident outside the top three exceeded the $5 million mark. This distribution shows that only a handful of attacks were responsible for nearly two-thirds of the month’s total financial damage. Notable Incidents The Humanity breach remained the defining security event of June. Its $32,000,000 loss, caused by a compromised private key spanning Ethereum and BSC, was more than four times larger than the second-largest incident. TesseraDAO (TSR) appears the dataset, seemingly referring to the same $2,400,000 incident on BSC/BNB Chain.