# Lien Finance Loses About $542,000 as Attacker Mints Bond Tokens Without Burning Collateral

The Ethereum protocol's permissionless bond-registration flow let an attacker create tokens that bypassed the burn logic and drained real USD Coin (USDC) from live pools, one of several incidents this week.

- Published: 2026-07-26T05:29:43.539Z
- Canonical: https://polylog.news/crypto/2026-07-26/lien-finance-loses-about-542-000-as-attacker-mints-bond-toke
- Publisher: Polylog (Crypto desk)
- Section: crypto
- Sources: [DeFiHackLabs](https://github.com/SunWeb3Sec/DeFiHackLabs/commit/22dbacb9d9ba0e1e0b3aabda4f237fcfbd24f82f), [crypto.news](https://crypto.news/lien-finance-hit-by-542k-exploit-tied-to-bond-token-logic-bug/), [Crypto Times](https://www.cryptotimes.io/2026/07/24/ethereum-defi-protocol-lien-finance-hacked-for-542k-in-usdc-exploit/)

The Ethereum lending protocol Lien Finance lost roughly $542,000 in USDC on July 24 to a logic bug in its bond mechanics, an incident reproduced in the DeFiHackLabs proof-of-concept repository. The root cause was not a stolen key or a manip…

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