CVE-2026-114115

EUVD-2026-106918
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.
Type Confusion
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
VulnCheckCNA
3.7 LOW
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 11.98%
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
vyperlangvyper
0.3.8 ≤
𝑥
≤ 0.5.0b1
CNA
Common Weakness Enumeration
References
https://github.com/vyperlang/vyper/commit/1fb7dfe2
https://github.com/vyperlang/vyper/security/advisories/GHSA-cw3h-xwxq-8cx2
https://www.vulncheck.com/advisories/vyper-0.3.8-through-0.5-0b1-memory-misread-via-ternary-nested-array-selection