CVE-2023-42460: Vyperlang Vyper

High severity, CVSS 7.5. EPSS: 0.7% chance of exploitation in the next 30 days.

Vyper is a Pythonic Smart Contract Language for the EVM. The `_abi_decode()` function does not validate input when it is nested in an expression. Uses of `_abi_decode()` can be constructed which allow for bounds checking to be bypassed resulting in incorrect results. This issue has not yet been fixed, but a fix is expected in release `0.3.10`. Users are advised to reference pull request #3626.

Affected products

• Vyperlang Vyper: from 0.3.4, before 0.3.10 (fixed in 0.3.10)

Published 2023-09-27. Last modified 2026-06-17.