CVE-2026-114115
Vyper 0.3.8 through 0.5.0b1 Memory Misread via Ternary Nested Array Selection
CVSS Score
3.7
EPSS Score
0.0%
EPSS Percentile
0th
Vyper 0.3.8 through 0.5.0b1 contains a compiler miscompilation vulnerability in parse_IfExp that reads nested arrays with narrower inner bounds using the wider result type's memory layout. When a ternary selects the narrower array, inner arrays after the first are read at wrong offsets, causing contracts to silently store corrupted values or revert.
| CWE | CWE-843 |
| Vendor | vyperlang |
| Product | vyper |
| Published | Oct 21, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None
Affected Versions
vyperlang / vyper
0.3.8 ≤ 0.5.0b1
References
Credits
harkal