{"id":"CVE-2020-8162","aliases":["GHSA-m42x-37p3-fv5w"],"url":"https://o3.security/vulnerability/CVE-2020-8162","summary":"Circumvention of file size limits in ActiveStorage","details":"A client side enforcement of server side security vulnerability exists in rails < 5.2.4.2 and rails < 6.0.3.1 ActiveStorage's S3 adapter that allows the Content-Length of a direct file upload to be modified by an end user bypassing upload limits.","published":"2020-06-19T17:15:18.583Z","modified":"2026-09-09T03:30:26.475796541Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},"epss":{"score":0.03028,"percentile":0.8642,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"RubyGems","name":"activestorage","fixedVersion":"5.2.4.3"},{"ecosystem":"RubyGems","name":"activestorage","fixedVersion":"6.0.3.1"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://www.debian.org/security/2020/dsa-4766"},{"type":"FIX","url":"https://groups.google.com/g/rubyonrails-security/c/PjU3946mreQ"},{"type":"EVIDENCE","url":"https://hackerone.com/reports/789579"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-09T03:30:26.475796541Z"}}