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.
Published: 2026-10-21
Score: 6.3 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Wed, 21 Oct 2026 17:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 21 Oct 2026 00:45:00 +0000

Type Values Removed Values Added
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.
Title Vyper 0.3.8 through 0.5.0b1 Memory Misread via Ternary Nested Array Selection
First Time appeared Vyperlang
Vyperlang vyper
Weaknesses CWE-843
CPEs cpe:2.3:a:vyperlang:vyper:*:*:*:*:*:*:*:*
Vendors & Products Vyperlang
Vyperlang vyper
References
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N'}

cvssV4_0

{'score': 6.3, 'vector': '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'}

Subscriptions

Vyperlang Vyper
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-21T15:49:19.495Z

Reserved: 2026-10-20T21:48:58.503Z

Link: CVE-2026-114115

cve-icon Vulnrichment

Updated: 2026-10-21T15:00:00.769Z

cve-icon NVD

Status : Received

Published: 2026-10-21T01:17:37.787

Modified: 2026-10-21T16:17:31.863

Link: CVE-2026-114115

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-21T15:30:10Z

Weaknesses
  • CWE-843

    Access of Resource Using Incompatible Type ('Type Confusion')