{"cve":"CVE-2026-33174","nvd":{"published":"2026-03-24T00:16:28.630","modified":"2026-06-17T10:37:04.797","status":"Analyzed","description":"Active Storage allows users to attach cloud and local files in Rails applications. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, when serving files through Active Storage's proxy delivery mode, the proxy controller loads the entire requested byte range into memory before sending it. A request with a large or unbounded Range header (e.g. `bytes=0-`) could cause the server to allocate memory proportional to the file size, possibly resulting in a DoS vulnerability through memory exhaustion. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U","score":6.6},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-789"],"references":["https://github.com/rails/rails/commit/2cd933c366b777f873d4d590127da2f4a25e4ba5","https://github.com/rails/rails/commit/42012eaaa88dfc7d0030161b2bc8074a7bbce92a","https://github.com/rails/rails/commit/8159a9c3de3f27a2bcf2866b8bf9ceb9075e229b","https://github.com/rails/rails/releases/tag/v7.2.3.1","https://github.com/rails/rails/releases/tag/v8.0.4.1"],"products":["rubyonrails:rails"],"source":"nvd","synced_at":"2026-10-19T22:26:19.218427112+00:00"},"epss":{"cve":"CVE-2026-33174","score":0.00621,"percentile":0.49801,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-r46p-8f7g-vvvg","url":"https://osv.dev/vulnerability/GHSA-r46p-8f7g-vvvg","summary":"Rails Active Storage has a possible DoS vulnerability when in proxy mode via Range requests","modified":"2026-09-10T03:50:40.647645834Z","packages":[{"ecosystem":"RubyGems","name":"activestorage","purl":"pkg:gem/activestorage","ranges":[">=8.1.0.beta1 <8.1.2.1"],"fixed":["8.1.2.1"]},{"ecosystem":"RubyGems","name":"activestorage","purl":"pkg:gem/activestorage","ranges":[">=8.0.0.beta1 <8.0.4.1"],"fixed":["8.0.4.1"]},{"ecosystem":"RubyGems","name":"activestorage","purl":"pkg:gem/activestorage","ranges":["<7.2.3.1"],"fixed":["7.2.3.1"]}]}],"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."]}