Is CVE-2023-31146 actively exploited?

No active exploitation of CVE-2023-31146 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2023-31146 be exploited remotely?

Yes. CVE-2023-31146 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2023-31146?

CVE-2023-31146 has a CVSS score of 9.1 (CRITICAL).

HOME VULNERABILITIESCVE-2023-31146

CRITICAL

CVE-2023-31146

CWE-787Published: May 11, 2023· Updated: Jun 17, 2026

9.1

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2023-31146 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.1.

From a weakness classification perspective (CWE-787): Out-of-bounds write vulnerabilities can lead to data corruption, crashes, or arbitrary code execution.