Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- 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-shadowin
FAQ
What is CVE-2026-114663?
CVE-2026-114663 is a vulnerability with a CVSS score of 8.4 (HIGH). 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...
How severe is CVE-2026-114663?
CVE-2026-114663 has been rated HIGH with a CVSS base score of 8.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-114663?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.