{"cve":"CVE-2026-33658","nvd":{"published":"2026-03-26T22:16:29.387","modified":"2026-06-17T10:37:52.553","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\nActive Storage's proxy controller does not limit the number of byte ranges in an HTTP Range header. A request with thousands of small ranges causes disproportionate CPU usage compared to a normal request for the same file, possibly resulting in a DoS vulnerability. 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:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U","score":2.3},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":6.5},"cwes":["CWE-770"],"references":["https://github.com/rails/rails/releases/tag/v7.2.3.1","https://github.com/rails/rails/releases/tag/v8.0.4.1","https://github.com/rails/rails/releases/tag/v8.1.2.1","https://github.com/rails/rails/security/advisories/GHSA-p9fm-f462-ggrg","https://github.com/rubysec/ruby-advisory-db/blob/master/gems/activestorage/CVE-2026-33658.yml"],"products":["rubyonrails:rails"],"source":"nvd","synced_at":"2026-10-19T22:28:18.033120106+00:00"},"epss":{"cve":"CVE-2026-33658","score":0.00451,"percentile":0.39237,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-p9fm-f462-ggrg","url":"https://osv.dev/vulnerability/GHSA-p9fm-f462-ggrg","summary":"Rails Active Storage has a possible DoS vulnerability in proxy mode via multi-range requests","modified":"2026-09-10T03:50:40.184257972Z","packages":[{"ecosystem":"RubyGems","name":"activestorage","purl":"pkg:gem/activestorage","ranges":[">=8.1.0 <8.1.2.1"],"fixed":["8.1.2.1"]},{"ecosystem":"RubyGems","name":"activestorage","purl":"pkg:gem/activestorage","ranges":[">=8.0.0 <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."]}