CVE-2023-42441

Name: CVE-2023-42441
Creator: NVD / NIST
Published: 2023-09-18T21:16:09.75+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.42%

Last modified Jun 17, 2026

CVE-2023-42441 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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. EPSS estimates a 0.42% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

5.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

EPSS Probability

0.42%

33.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Vyperlang	Vyper	>= 0.2.9, < 0.3.10

References

https://github.com/vyperlang/vyper/commit/0b740280c1e3c5528a20d47b29831948ddcc6d83Patch
https://github.com/vyperlang/vyper/pull/3605Issue Tracking, Patch
https://github.com/vyperlang/vyper/security/advisories/GHSA-3hg2-r75x-g69mExploit, Patch, Vendor Advisory
https://github.com/vyperlang/vyper/commit/0b740280c1e3c5528a20d47b29831948ddcc6d83Patch
https://github.com/vyperlang/vyper/pull/3605Issue Tracking, Patch
https://github.com/vyperlang/vyper/security/advisories/GHSA-3hg2-r75x-g69mExploit, Patch, Vendor Advisory

Timeline

Published: Sep 18, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-42441?

How severe is CVE-2023-42441?

CVE-2023-42441 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.42% probability of exploitation in the next 30 days.

How do I fix CVE-2023-42441?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-42441?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST