CVE-2026-114663

8.6 highEPSS 0.2%

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 4.0: 8.6CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.1: 8.4CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS: 0.2% chance of exploitation in the next 30 days; higher than 7% of CVEs (scores of 2026-10-25)
CWE: CWE-706
Published: 2026-10-22
Modified: 2026-10-23
Record from: the NVD, synced 2026-10-23

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-shadowing-of-imported-constants-and-default-arguments

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