CVE-2026-114663
Vyper 0.4.0b1 through 0.5.0b1 Name Shadowing of Imported Constants and Default Arguments
CVSS Score
8.4
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-706 |
| Vendor | vyperlang |
| Product | vyper |
| Published | Oct 22, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
vyperlang / vyper
0.4.0b1 ≤ 0.5.0b1