What’s Vulnerable › Vulnerabilities

CVE-2024-32648: vyper default functions don't respect nonreentrancy keys

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-04-25 · updated 2026-06-17
• Weakness: CWE-667

Description

Vyper is a pythonic Smart Contract Language for the Ethereum virtual machine. Prior to version 0.3.0, default functions don't respect nonreentrancy keys and the lock isn't emitted. No vulnerable production contracts were found. Additionally, using a lock on a `default` function is a very sparsely used pattern. As such, the impact is low. Version 0.3.0 contains a patch for the issue.

Affected products

• vyperlang vyper: before 0.3.0 — fixed in 0.3.0

How to fix

Upgrade to a fixed version: vyperlang vyper 0.3.0. Check the vendor advisory for mitigations.

References

• https://github.com/vyperlang/vyper/commit/93287e5ac184b53b395c907d40701f721daf8177
• https://github.com/vyperlang/vyper/issues/2455
• https://github.com/vyperlang/vyper/security/advisories/GHSA-m2v9-w374-5hj9
• https://github.com/vyperlang/vyper/commit/93287e5ac184b53b395c907d40701f721daf8177
• https://github.com/vyperlang/vyper/issues/2455
• https://github.com/vyperlang/vyper/security/advisories/GHSA-m2v9-w374-5hj9

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