{"id":"CVE-2021-48019","revision":"3b0cccbe308d4f69bc5fc097e2d04d09","records":[{"revision":"3b0cccbe308d4f69bc5fc097e2d04d09","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2021-48019","aliases":[],"title":"Vyper before 0.2.9 Incorrect RETURNDATASIZE in create_forwarder_to Proxies","description":"Vyper before 0.2.9 deploys forwarder proxies through the built-in create_forwarder_to function that report a fixed 4096-byte RETURNDATASIZE rather than the actual return data size. Calls through these proxies can yield corrupted data when a function returns more than 4096 bytes without return data sanitation, and fail strict return-size checks such as SafeERC20.safeTransfer.","state":0,"publishedAt":"2026-10-21T00:36:18.96+00:00","modifiedAt":"2026-10-21T00:36:18.96+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\": \"0.2.9\"\n                        },\n                        {\n                            \"version\": \"0.2.9\",\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:L/VA:L/SC:N/SI:N/SA:N","score":6.3,"severity":"MEDIUM"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L","score":4.8,"severity":"MEDIUM"}],"references":["https://github.com/vyperlang/vyper/security/advisories/GHSA-375m-5fvv-xq23","https://www.vulncheck.com/advisories/vyper-before-0.2.9-incorrect-returndatasize-in-create-forwarder-to-proxies"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2021-48019","license":"CVE Program Terms of Use","key":"cve-program:CVE-2021-48019","identifiers":["CVE-2021-48019"]},"retained":false,"historicalAffected":[]}],"coverage":[]}