{"schema":"threatline.record/2","record":{"id":"CVE-2020-37287","aliases":["GHSA-4v7v-gqf9-ww2g"],"summary":"Vyper before 0.2.6 Call Stack Corruption via Complex Type Function Arguments","details":"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.","categories":["Libraries & packages"],"product":"vyper","vendor":"vyperlang","ecosystem":"PyPI","affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2020-37287","source_modified_at":"2026-10-21T00:36:16.257Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"vyper","vendor":"vyperlang","versions":[{"version":"0","status":"affected","versionType":"python","lessThan":"0.2.6"},{"version":"0.2.6","status":"unaffected","versionType":"python"}],"defaultStatus":"unaffected"},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-4v7v-gqf9-ww2g","source_modified_at":"2026-10-06T15:30:03.646574259Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"PyPI","name":"vyper","purl":"pkg:pypi/vyper"},"ranges":[{"events":[{"introduced":"0"},{"fixed":"0.2.6"}],"type":"ECOSYSTEM"}],"versions":["0.1.0b1","0.1.0b10","0.1.0b11","0.1.0b12","0.1.0b13","0.1.0b14","0.1.0b15","0.1.0b16","0.1.0b17","0.1.0b2","0.1.0b3","0.1.0b4","0.1.0b5","0.1.0b6","0.1.0b7","0.1.0b8","0.1.0b9","0.2.1","0.2.2","0.2.3","0.2.4","0.2.5"]}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2020-37287","source_modified_at":"2026-10-21T00:36:16.257Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"vyper","ecosystem":null},"version":"0.2.6","basis":"first unaffected version stated in the CVE record"},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-4v7v-gqf9-ww2g","source_modified_at":"2026-10-06T15:30:03.646574259Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"PyPI","name":"vyper","purl":"pkg:pypi/vyper"},"version":"0.2.6"}],"cvss":8.2,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00251,"percentile":0.1569,"score_date":"2026-10-23"},"published_at":"2026-10-21T00:36:16.257Z","modified_at":"2026-10-21T00:36:16.257Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2020-37287","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-21T00:36:16.257Z"},{"source":"OSV","url":"https://osv.dev/vulnerability/GHSA-4v7v-gqf9-ww2g","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-06T15:30:03.646574259Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2020-37287","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","OSV","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/vyperlang/vyper/security/advisories/GHSA-4v7v-gqf9-ww2g","tags":["vendor-advisory"]},{"source":"CVE List","url":"https://www.vulncheck.com/advisories/vyper-before-0.2.6-call-stack-corruption-via-complex-type-function-arguments","tags":["third-party-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"ecosystem","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-21T00:36:16.257Z","content_hash":"564b65f25d9c949060dc0977370de7df721b083e000781c8ea67e321922ca87c"}}