Buffer overflow in Vyperlang Vyper
CVE-2020-37286
Vyper from 0.1.0b4 before 0.3.0 contains a memory corruption vulnerability caused by an incorrect stack tip pointer when internal function calls appear inside tuples or nested calls. Contracts using such calls as tuple elements, call arguments, or builtin arguments like concat or ecrecover can return corrupted values or pass wrong arguments to external calls.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:L.
EPSS exploit prediction
EPSS: 0.003 (19.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 19.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
The 30-day trend appears once there are two daily scores.
Affected products
Weakness classification (CWE)
References
- github.com/vyperlang/vyper/security/advisories/GHSA-2r3x-4mrv-mcxf (vendor-advisory)
- www.vulncheck.com/advisories/vyper-0.1-0b4-before-0.3.0-memory-corruption-via-n… (third-party-advisory)
Frequently asked questions
- What is CVE-2020-37286?
- CVE-2020-37286 is a medium-severity vulnerability in Vyperlang Vyper, classified under Out-of-bounds Write. CVSS score: 6.5/10. Published 2026-10-21.
- How severe is CVE-2020-37286?
- Medium severity. CVSS v3 base score is 6.5 out of 10.