CVE-2023-31146
High
Description
Vyper is a Pythonic smart contract language for the Ethereum virtual machine. Prior to version 0.3.8, during codegen, the length word of a dynarray is written before the data, which can result in out-of-bounds array access in the case where the dynarray is on both the lhs and rhs of an assignment. The issue can cause data corruption across call frames. The expected behavior is to revert due to out-of-bounds array access. Version 0.3.8 contains a patch for this issue.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Vyper
PublishedMay 11, 2023
First seenMay 11, 2023
Weakness typeCWE-787Out-of-bounds write
How to fix
Update
- vyperlang vyper0.3.8 or later
- vyper0.3.8 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| vyperlang vyper | v < 0.3.8 | 0.3.8 |
| vyperPyPI | v < 0.3.8 | 0.3.8 |
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