CVE-2023-46247

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
13/12/2023
Last modified:
19/12/2023

Description

Vyper is a Pythonic Smart Contract Language for the Ethereum Virtual Machine (EVM). Contracts containing large arrays might underallocate the number of slots they need by 1. Prior to v0.3.8, the calculation to determine how many slots a storage variable needed used `math.ceil(type_.size_in_bytes / 32)`. The intermediate floating point step can produce a rounding error if there are enough bits set in the IEEE-754 mantissa. Roughly speaking, if `type_.size_in_bytes` is large (> 2**46), and slightly less than a power of 2, the calculation can overestimate how many slots are needed by 1. If `type_.size_in_bytes` is slightly more than a power of 2, the calculation can underestimate how many slots are needed by 1. This issue is patched in version 0.3.8.

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:vyperlang:vyper:*:*:*:*:*:python:*:* 0.3.8 (excluding)