CVE-2020-37289

Low

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.

SeverityLow

CVSS3.7

Exploit probability—

Product

Vyper

PublishedOct 21, 2026

First seenOct 21, 2026

Weakness typeCWE-20Improper input validation

How to fix

Vendor advisories

github.com/vyperlang/vyper/security/advisories/GHSA-mr6r-mvw4-736g

Affected products

Product	Affected versions	Fixed in
vyperPyPI	v ≤ 0.1.0b16	—

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