---
title: "CVE-2026-114663: Vyper - Logic Corruption"
description: "Vyper 0.4.0b1 through 0.5.0b1 contains a logic corruption vulnerability caused by miscompilation of unfoldable constants and omitted default arguments in imported modules, letting attackers manipulate values to corrupt validation or accounting logic, exploit requires attacker-controlled input with conflicting variable names."
url: https://panop.io/threat-heartbeat/CVE-2026-114663/
---

# CVE-2026-114663 Vyper - Logic Corruption

Vyper 0.4.0b1 through 0.5.0b1 contains a logic corruption vulnerability caused by miscompilation of unfoldable constants and omitted default arguments in imported modules, letting attackers manipulate values to corrupt validation or accounting logic, exploit requires attacker-controlled input with conflicting variable names.

CVSS base score 8.4 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.14% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-114663)

## Details

Type

Logic Corruption

Impact

Data Tampering

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Published

22 October 2026

Updated

23 October 2026

Weakness

[CWE-706](https://cwe.mitre.org/data/definitions/706.html)

## Vendor fix

Update to a version later than 0.5.0b1 or the latest available version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-114663](https://nvd.nist.gov/vuln/detail/CVE-2026-114663)
- [https://github.com/vyperlang/vyper/security/advisories/GHSA-2489-32vh-8rrc](https://github.com/vyperlang/vyper/security/advisories/GHSA-2489-32vh-8rrc)
- [https://www.vulncheck.com/advisories/vyper-0.4-0b1-through-0.5-0b1-name-shadowing-of-imported-constants-and-default-arguments](https://www.vulncheck.com/advisories/vyper-0.4-0b1-through-0.5-0b1-name-shadowing-of-imported-constants-and-default-arguments)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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