CVE-2023-31146

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.

How to fix CVE-2023-31146

To remediate CVE-2023-31146, upgrade the affected package to a fixed version below.

• —upgrade to 0.3.8 or later
• —upgrade to 4f8289a81206f767df1900ac48f485d90fc87edb or later

Is CVE-2023-31146 being exploited?

Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 0.3.8
• from 0, < 4f8289a81206f767df1900ac48f485d90fc87edb | from 0, < 0.3.8

CVSS scores

References (5)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2023-31146
• PATCHgithub.com/vyperlang/vyper
• WEBgithub.com/pypa/advisory-database/tree/main/vulns/vyper/PYSEC-2023-77.yaml
• WEBgithub.com/vyperlang/vyper/commit/4f8289a81206f767df1900ac48f485d90fc87edb