CVE-2022-29255: Vyperlang Vyper

High severity, CVSS 7.5. EPSS: 1.3% chance of exploitation in the next 30 days.

Vyper is a Pythonic Smart Contract Language for the ethereum virtual machine. In versions prior to 0.3.4 when a calling an external contract with no return value, the contract address (including side effects) could be evaluated twice. This may result in incorrect outcomes for contracts. This issue has been addressed in v0.3.4.

Affected products

• Vyperlang Vyper: before 0.3.4 (fixed in 0.3.4)

Published 2022-06-09. Last modified 2026-06-17.