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Contracts placing internal calls in nested array elements, external call arguments, struct literals, or raw_log topics can have memory corrupted, producing incorrect contract behavior.","state":0,"publishedAt":"2026-10-21T00:36:19.625+00:00","modifiedAt":"2026-10-28T15:11:17.839+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\": \"0.1.0b4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"python\",\n                            \"lessThan\": \"0.3.0\"\n                        },\n                        {\n                            \"version\": \"0.3.0\",\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:L/SC:N/SI:N/SA:N","score":8.3,"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:L","score":6.5,"severity":"MEDIUM"}],"references":["https://github.com/vyperlang/vyper/security/advisories/GHSA-22wc-c9wj-6q2v","https://www.vulncheck.com/advisories/vyper-before-0.3.0-memory-corruption-via-internal-function-calls-in-arrays"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2021-48020","license":"CVE Program Terms of Use","key":"cve-program:CVE-2021-48020","identifiers":["CVE-2021-48020"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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