[ CVE-2020-37289 · Published 21 Oct 2026 ]
Vulnerability in vyperlang vyper
CVSS 3.7
EPSS <1%No fix listed yet
[ Description ]Official description
Vyper before 0.3.1 lacks a uint8 type, allowing interface return values declared as uint8, such as ERC20.decimals(), to be stored in uint256 variables without bounds checking. Malicious contracts can return values greater than 255 to manipulate or bypass contract logic that relies on these values.
[ Fixes ]Fixes and patches
No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.