Bug 2557998 (CVE-2020-37289) - CVE-2020-37289 vyper: Vyper: Contract logic bypass via unvalidated interface return values
Summary: CVE-2020-37289 vyper: Vyper: Contract logic bypass via unvalidated interface ...
Keywords:
Status: NEW
Alias: CVE-2020-37289
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2565616
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-10-21 00:58 UTC by OSIDB Bzimport
Modified: 2026-11-03 07:39 UTC (History)
0 users

Fixed In Version:
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Description OSIDB Bzimport 2026-10-21 00:58:49 UTC 
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.
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