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CVE-2026-114663

8.4, high

Vyper 0.4.0b1 through 0.5.0b1 miscompiles unfoldable constants and omitted default arguments from imported modules, because parse_Name…

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
8.4, high high CVSS v3.1
EPSS, next 30 days
0.1% higher than 2.7% of scored CVEs
Exploitation
No public evidence
Published
22 Oct 2026yesterday

Description

Vyper 0.4.0b1 through 0.5.0b1 miscompiles unfoldable constants and omitted default arguments from imported modules, because parse_Name resolves their names in the using function's scope rather than at declaration. When a contract's parameter, local, or loop variable shares such a name, attacker-influenced input can replace the intended value, including out-of-range values for narrow types such as uint8, corrupting validation or accounting logic.

Details

Vendor
Vyperlang
Product
vyper
Weakness
CWE-706 (opens in a new tab)
Status
Deferred
Updated
22 Oct 2026
Assigner
disclosure@vulncheck.com

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

References 2

Advisories 1

Other references 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Vyperlang CVEs

Every Vyperlang CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2021-48018 Vyperlang vyper Out-of-Bounds Write Vulnerability EPSS 0.3% 7.4, high

Beyond this page

Is CVE-2026-114663 in your network?

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 23 Oct 2026, not the live upstream state.