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Immunefi: DeFi Attack Losses Down 74% from 2022 Peak, AI Accelerates Security Arms Race

Web3 security company Immunefi's latest "2026 Ecosystem Vulnerability Audit Report" shows that losses from DeFi protocol hacks have fallen 74% from a peak of $2.62 billion in 2022 to approximately $680.3 million in 2025.The report notes that the median loss per individual attack has also significantly decreased, from $6 million in 2022 to $1.5 million in 2025, reflecting an overall improvement in security standards. Meanwhile, the share of bridge exploits in total DeFi losses has dropped sharply from 73% in 2022 to 3% in 2025, and the proportion of flash loan attacks has fallen from 54% to less than 1%.The proportion of risks at the infrastructure level (such as private key leaks and database attacks) also decreased from 30.7% in 2022 to 10.3% in 2025. Immunefi stated that this reflects continuous optimization in oracle design, reentrancy attack protection, and access control standards, making the DeFi ecosystem "generally becoming safer."However, the report also notes that losses slightly rebounded to $680.3 million in 2025, primarily due to increased complexity in multi-chain systems and a few high-severity incidents. At the same time, the number of independent security incidents continues to rise, indicating the attack surface is still expanding. (The Block)

AaveLabs: Updates Bug Bounty Program, Core Aave V3 Maximum Reward Raised to $5 Million

that, according to official sources, AaveLabs has proposed restructuring the Aave DAO bug bounty framework into multiple specific subsystem programs, operating on the Immunefi, Sherlock, and Cantina platforms respectively. Core Aave V3, Core Aave V2, GHO, and non-liquidity protocol infrastructure will be covered by Immunefi; Aave V4 and the Aave App Stack will be covered by Sherlock; and Aave V3 on Aptos will be covered by Cantina.The proposal suggests adjusting the bounty scale for each system. The maximum reward for critical vulnerabilities in Core Aave V3 is $5 million, while the maximum reward for critical vulnerabilities in Aave V4 is $2.5 million. Additionally, the funding source for the Aave V3 bug bounty on Aptos will be transferred from Aave Labs to the Aave DAO. This ARFC proposal has currently been passed.

USDT0 Reveals Security Architecture Details: Implements 3/3 Verification Mechanism and Launches $6 Million Bug Bounty Program

following the Kelp security incident, Tether's asset interoperability protocol USDT0 has disclosed details of its protocol security architecture. It stated that the system currently utilizes a proprietary DVN (Decentralized Verification Network) with message veto authority, and requires 3 independent validators, operating on different codebases, to reach a 3/3 consensus before cross-chain messages can be settled. The current verification nodes include the USDT0 proprietary DVN, LayerZero, and Canary, with future plans to expand to 4/4 and 5/5 verification mechanisms.USDT0 also stated that all multi-signature transactions must undergo multiple reviews by internal teams, external security teams, and auditing firms before signatures are submitted. The relevant contracts have been audited by firms such as Guardian and OpenZeppelin, and a $6 million bug bounty program has been launched on Immunefi.