What’s Vulnerable › Vulnerabilities

CVE-2026-114115: Vyper 0.3.8 through 0.5.0b1 Memory Misread via Ternary Nested Array Selection

• Severity: low (CVSS 3.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-21 · updated 2026-10-22
• Weakness: CWE-843

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.

Affected products

• vyperlang vyper: from 0.3.8 through 0.5.0b1

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

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