{"id":"CVE-2020-37287","revision":"dee23b3bfec14aa1945cff831a739ef8","records":[{"revision":"dee23b3bfec14aa1945cff831a739ef8","observedAt":"2026-10-28T16:46:48.767+00:00","statement":{"source":"cve-program","id":"CVE-2020-37287","aliases":[],"title":"Vyper before 0.2.6 Call Stack Corruption via Complex Type Function Arguments","description":"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.","state":0,"publishedAt":"2026-10-21T00:36:16.257+00:00","modifiedAt":"2026-10-28T15:00:19.8+00:00","affected":[{"ecosystem":"Vendor product","name":"vyper","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"vyperlang\",\n                    \"product\": \"vyper\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"packageURL\": \"pkg:pypi/vyper\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"python\",\n                            \"lessThan\": \"0.2.6\"\n                        },\n                        {\n                            \"version\": \"0.2.6\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"python\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","score":8.2,"severity":"HIGH"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","score":5.9,"severity":"MEDIUM"}],"references":["https://github.com/vyperlang/vyper/security/advisories/GHSA-4v7v-gqf9-ww2g","https://www.vulncheck.com/advisories/vyper-before-0.2.6-call-stack-corruption-via-complex-type-function-arguments"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2020-37287","license":"CVE Program Terms of Use","key":"cve-program:CVE-2020-37287","identifiers":["CVE-2020-37287"]},"retained":false,"historicalAffected":[]}],"coverage":[]}