CVE-2026-114115

Low

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.

SeverityLow

CVSS3.7

Exploit probability—

Product

Vyper

PublishedOct 21, 2026

First seenOct 21, 2026

Weakness typeCWE-843CWE-843

How to fix

Patches

github.com/vyperlang/vyper/commit/1fb7dfe2

Vendor advisories

github.com/vyperlang/vyper/security/advisories/GHSA-cw3h-xwxq-8cx2

Affected products

Product	Affected versions	Fixed in
vyperlang vyper	0.3.8 ≤ v ≤ 0.5.0b1	—

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