Vulnerability in Vyperlang Vyper
CVE-2020-37287
Vyper before 0.2.6 contains a call stack corruption vulnerability that causes incorrect function outputs when complex types with non-base members are passed as arguments. Contracts passing multi-dimensional arrays or structs to internal or external functions receive corrupted values because the compiler assumed each subtype size is 32.
Published .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/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
Weakness classification (CWE)
References
- github.com/vyperlang/vyper/security/advisories/GHSA-4v7v-gqf9-ww2g (vendor-advisory)
- www.vulncheck.com/advisories/vyper-before-0.2.6-call-stack-corruption-via-compl… (third-party-advisory)
Frequently asked questions
- What is CVE-2020-37287?
- CVE-2020-37287 is a medium-severity vulnerability in Vyperlang Vyper, classified under Incorrect Calculation of Buffer Size. CVSS score: 5.9/10. Published 2026-10-21.
- How severe is CVE-2020-37287?
- Medium severity. CVSS v3 base score is 5.9 out of 10.