667 833
Advisory Published
CVE Published


First published: Mon Sep 18 2023(Updated: )

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 SoftwareAffected VersionHow to fix
Vyperlang Vyper>=0.2.9<0.3.10

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Frequently Asked Questions

  • What is CVE-2023-42441?

    CVE-2023-42441 is a vulnerability in the Vyper smart contract language that allows reentrancy attacks.

  • What is the impact of CVE-2023-42441?

    The impact of CVE-2023-42441 is that locks with the `@nonreentrant` decorator do not produce reentrancy checks at runtime, making the smart contract vulnerable to reentrancy attacks.

  • How do I fix CVE-2023-42441?

    To fix CVE-2023-42441, update to Vyper version 0.3.10 or higher.

  • Where can I find more information about CVE-2023-42441?

    You can find more information about CVE-2023-42441 at the following references: [Link 1](, [Link 2](, [Link 3](

  • What is the severity of CVE-2023-42441?

    CVE-2023-42441 has a severity rating of 5.3 (medium).


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