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DeFi Protocol Lien Finance Loses $542,144 in USDC to Smart Contract Exploit

Security Incidents

2026-07-24 07:30:54

According to Slow Mist, DeFi protocol Lien Finance was attacked on July 24, with hackers exploiting a smart contract vulnerability to steal approximately 542,144 USDC (around $542,000). Attackers bypassed the bond redemption validation logic, minting unsecured BondTokens without destroying corresponding input bonds, then converted the tokens to USDC through pre-authorized addresses. The vulnerability stemmed from insufficient verification in the bond token exchange mechanism, allowing attackers to circumvent collateral constraints.

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