What is CVE-2026-114115?

CVE-2026-114115 is a low-severity vulnerability in Vyperlang Vyper, classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 3.7/10. Published 2026-10-21.

How severe is CVE-2026-114115?

Low severity. CVSS v3 base score is 3.7 out of 10.

Vulnerability in Vyperlang Vyper

CVE-2026-114115

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 · last modified 2026-10-21.

CVSS v3 metric

CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Vyperlang Vyper

Weakness classification (CWE)

CWE-843 — Access of Resource Using Incompatible Type (Type Confusion)

References

github.com/vyperlang/vyper/security/advisories/GHSA-cw3h-xwxq-8cx2 (vendor-advisory)
github.com/vyperlang/vyper/commit/1fb7dfe2 (patch)
www.vulncheck.com/advisories/vyper-0.3.8-through-0.5-0b1-memory-misread-via-ter… (third-party-advisory)

Frequently asked questions

What is CVE-2026-114115?: CVE-2026-114115 is a low-severity vulnerability in Vyperlang Vyper, classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 3.7/10. Published 2026-10-21.
How severe is CVE-2026-114115?: Low severity. CVSS v3 base score is 3.7 out of 10.