Definition ∞ A re-entrancy variant refers to a specific form or modification of the re-entrancy attack, a common security vulnerability in smart contracts. In a re-entrancy attack, a malicious contract repeatedly calls a vulnerable contract before the first call has completed, draining funds or manipulating its state. A variant might involve more subtle execution flows or exploit interactions between multiple contracts. Understanding these variations is crucial for developing robust smart contract security.
Context ∞ Crypto news frequently reports on re-entrancy variants as they continue to be a significant threat in the decentralized finance (DeFi) space, leading to substantial asset losses. Security audits and bug bounties often target the detection and mitigation of these complex attack vectors. Developers are constantly refining smart contract best practices and employing security patterns, such as checks-effects-interactions, to guard against both known re-entrancy forms and their novel variants.
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