CVE-2026-114115
Vyper 0.3.8 through 0.5.0b1 Memory Misread via Ternary Nested Array Selection
- State
- Published
- Severity
- 6.3 Medium
- Published
- Oct 21, 2026
- Updated
- Oct 21, 2026
- Reserved
- Oct 20, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.3 Medium | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 3.7 Low | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N | VulnCheck |
Weaknesses
- CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')
Affected Products
| Product | Versions |
|---|---|
vypervyperlang |
|
References
- GitHub Security Advisory (GHSA-cw3h-xwxq-8cx2)vendor-advisory
- Patch Commitpatch
- VulnCheck Advisory: Vyper 0.3.8 through 0.5.0b1 Memory Misread via Ternary Nested Array Selectionthird-party-advisory
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