Vulnerability in Vyperlang Vyper
CVE-2026-114663
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.4 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/vyperlang/vyper/security/advisories/GHSA-2489-32vh-8rrc (vendor-advisory)
- www.vulncheck.com/advisories/vyper-0.4-0b1-through-0.5-0b1-name-shadowing-of-im… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-114663?
- CVE-2026-114663 is a high-severity vulnerability in Vyperlang Vyper, classified under Use of Incorrectly-Resolved Name or Reference. CVSS score: 8.4/10. Published 2026-10-22.
- How severe is CVE-2026-114663?
- High severity. CVSS v3 base score is 8.4 out of 10.