CVE-2020-37289
Low · 3.7CVSS
3.7
EPSS
0.3%
Published
Oct 21, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|
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