{"cve":"CVE-2020-8162","nvd":{"published":"2020-06-19T17:15:18.583","modified":"2026-06-17T03:25:58.070","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","score":7.5},"cwes":["CWE-434","CWE-602"],"references":["https://groups.google.com/g/rubyonrails-security/c/PjU3946mreQ","https://hackerone.com/reports/789579","https://www.debian.org/security/2020/dsa-4766","https://groups.google.com/g/rubyonrails-security/c/PjU3946mreQ","https://hackerone.com/reports/789579"],"products":["debian:debian_linux","rubyonrails:rails"],"source":"nvd","synced_at":"2026-10-19T21:05:42.039641217+00:00"},"epss":{"cve":"CVE-2020-8162","score":0.03028,"percentile":0.87478,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-m42x-37p3-fv5w","url":"https://osv.dev/vulnerability/GHSA-m42x-37p3-fv5w","summary":"Circumvention of file size limits in ActiveStorage","modified":"2024-02-22T05:37:26.373913Z","packages":[{"ecosystem":"RubyGems","name":"activestorage","purl":"pkg:gem/activestorage","ranges":[">=5.0.0 <5.2.4.3"],"fixed":["5.2.4.3"]},{"ecosystem":"RubyGems","name":"activestorage","purl":"pkg:gem/activestorage","ranges":[">=6.0.0 <6.0.3.1"],"fixed":["6.0.3.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}