MEDIUM 6.3 NVD
CVE-2020-37289
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 b
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.
References
- https://github.com/vyperlang/vyper/security/advisories/GHSA-mr6r-mvw4-736g
- https://www.vulncheck.com/advisories/vyper-before-0.3.1-improper-input-validation-of-uint8
This medium severity vulnerability with a CVSS score of 6.3 was published on 2026-10-21 via NVD.
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