CVE-2023-42441: Vyperlang Vyper

Medium severity, CVSS 5.3. EPSS: 0.5% chance of exploitation in the next 30 days.

Vyper is a Pythonic Smart Contract Language for the Ethereum Virtual Machine (EVM). Starting in version 0.2.9 and prior to version 0.3.10, locks of the type `@nonreentrant("")` or `@nonreentrant('')` do not produce reentrancy checks at runtime. This issue is fixed in version 0.3.10. As a workaround, ensure the lock name is a non-empty string.

Affected products

• Vyperlang Vyper: from 0.2.9, before 0.3.10 (fixed in 0.3.10)

Published 2023-09-18. Last modified 2026-06-17.