{"id":"CVE-2026-33658","aliases":["DEBIAN-CVE-2026-33658","EUVD-2026-16426","GHSA-p9fm-f462-ggrg","UBUNTU-CVE-2026-33658"],"status":"published","title":"Rails Active Storage has a possible DoS vulnerability in proxy mode via multi-range requests","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.","severity":{"version":"4.0","score":2.3,"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","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00451,"percentile":0.39525,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-770"],"published":"2026-03-25T21:04:50Z","modified":"2026-10-28T02:30:31Z","fixes":[{"ecosystem":"RubyGems","package":"activestorage","fixed_in":["8.1.2.1","8.0.4.1","7.2.3.1"],"sources":["ghsa","osv"]},{"ecosystem":"Debian:13","package":"rails","fixed_in":["2:7.2.2.2+dfsg-2~deb13u2"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"rails","fixed_in":["2:7.2.3.1+dfsg-1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"RubyGems","package":"activestorage","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"8.1.0"},{"fixed":"8.1.2.1"}]}]},{"source":"ghsa","ecosystem":"RubyGems","package":"activestorage","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"8.0.0"},{"fixed":"8.0.4.1"}]}]},{"source":"ghsa","ecosystem":"RubyGems","package":"activestorage","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.2.3.1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"rails","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:7.2.2.2+dfsg-2~deb13u2"}]}],"versions":["2:7.2.2.1+dfsg-7","2:7.2.2.2+dfsg-1","2:7.2.2.2+dfsg-2~deb13u1"]},{"source":"osv","ecosystem":"Debian:14","package":"rails","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:7.2.3.1+dfsg-1"}]}],"versions":["2:7.2.2.1+dfsg-7","2:7.2.2.2+dfsg-1","2:7.2.2.2+dfsg-2","2:7.2.2.2+dfsg-2~deb13u1","2:7.2.2.2+dfsg-2~deb13u2","2:7.2.3+dfsg-1","2:7.2.3+dfsg-2","2:7.2.3+dfsg-3"]},{"source":"osv","ecosystem":"RubyGems","package":"activestorage","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"8.1.0"},{"fixed":"8.1.2.1"}]}],"versions":["8.1.0","8.1.1","8.1.2"]},{"source":"osv","ecosystem":"RubyGems","package":"activestorage","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"8.0.0"},{"fixed":"8.0.4.1"}]}],"versions":["8.0.0","8.0.0.1","8.0.1","8.0.2","8.0.2.1","8.0.3","8.0.4"]},{"source":"osv","ecosystem":"RubyGems","package":"activestorage","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.2.3.1"}]}],"versions":["0.1","5.2.0","5.2.0.beta1","5.2.0.beta2","5.2.0.rc1","5.2.0.rc2","5.2.1","5.2.1.1","5.2.1.rc1","5.2.2","5.2.2.1","5.2.2.rc1","5.2.3","5.2.3.rc1","5.2.4","5.2.4.1","5.2.4.2","5.2.4.3","5.2.4.4","5.2.4.5","5.2.4.6","5.2.4.rc1","5.2.5","5.2.6","5.2.6.1","5.2.6.2","5.2.6.3","5.2.7","5.2.7.1","5.2.8","5.2.8.1","6.0.0","6.0.0.beta1","6.0.0.beta2","6.0.0.beta3","6.0.0.rc1","6.0.0.rc2","6.0.1","6.0.1.rc1","6.0.2","6.0.2.1","6.0.2.2","6.0.2.rc1","6.0.2.rc2","6.0.3","6.0.3.1","6.0.3.2","6.0.3.3","6.0.3.4","6.0.3.5","6.0.3.6","6.0.3.7","6.0.3.rc1","6.0.4","6.0.4.1","6.0.4.2","6.0.4.3","6.0.4.4","6.0.4.5","6.0.4.6","6.0.4.7","6.0.4.8","6.0.5","6.0.5.1","6.0.6","6.0.6.1","6.1.0","6.1.0.rc1","6.1.0.rc2","6.1.1","6.1.2","6.1.2.1","6.1.3","6.1.3.1","6.1.3.2","6.1.4","6.1.4.1","6.1.4.2","6.1.4.3","6.1.4.4","6.1.4.5","6.1.4.6","6.1.4.7","6.1.5","6.1.5.1","6.1.6","6.1.6.1","6.1.7","6.1.7.1","6.1.7.10","6.1.7.2","6.1.7.3","6.1.7.4","6.1.7.5","6.1.7.6","6.1.7.7","6.1.7.8","6.1.7.9","7.0.0","7.0.0.alpha1","7.0.0.alpha2","7.0.0.rc1","7.0.0.rc2","7.0.0.rc3","7.0.1","7.0.10","7.0.2","7.0.2.1","7.0.2.2","7.0.2.3","7.0.2.4","7.0.3","7.0.3.1","7.0.4","7.0.4.1","7.0.4.2","7.0.4.3","7.0.5","7.0.5.1","7.0.6","7.0.7","7.0.7.1","7.0.7.2","7.0.8","7.0.8.1","7.0.8.2","7.0.8.3","7.0.8.4","7.0.8.5","7.0.8.6","7.0.8.7","7.1.0","7.1.0.beta1","7.1.0.rc1","7.1.0.rc2","7.1.1","7.1.2","7.1.3","7.1.3.1","7.1.3.2","7.1.3.3","7.1.3.4","7.1.4","7.1.4.1","7.1.4.2","7.1.5","7.1.5.1","7.1.5.2","7.1.6","7.2.0","7.2.0.beta1","7.2.0.beta2","7.2.0.beta3","7.2.0.rc1","7.2.1","7.2.1.1","7.2.1.2","7.2.2","7.2.2.1","7.2.2.2","7.2.3"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"rails","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:4.1.10-1","2:4.2.5-1","2:4.2.5.1-1","2:4.2.5.2-2","2:4.2.6-1","2:4.2.6-1ubuntu0.1~esm1","2:4.2.6-1ubuntu0.1~esm2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"rails","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:4.2.9-2","2:4.2.9-4","2:4.2.10-0ubuntu4","2:4.2.10-0ubuntu4+esm1","2:4.2.10-0ubuntu4+esm2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"rails","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:5.2.2.1+dfsg-1ubuntu1","2:5.2.3+dfsg-3","2:5.2.3+dfsg-3ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:22.04:LTS","package":"rails","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:6.0.3.7+dfsg-2","2:6.1.4.1+dfsg-8ubuntu2","2:6.1.4.1+dfsg-8ubuntu2+esm1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"rails","ranges":[{"type":"ECO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Advisory","advisory","web","report"]},{"url":"https://github.com/rails/rails/releases/tag/v7.2.3.1","tags":["x_refsource_MISC","Product","Release Notes","web","report"]},{"url":"https://github.com/rails/rails/releases/tag/v8.0.4.1","tags":["x_refsource_MISC","Product","Release Notes","web","report"]},{"url":"https://github.com/rails/rails/releases/tag/v8.1.2.1","tags":["x_refsource_MISC","Product","Release Notes","web","report"]},{"url":"https://github.com/rubysec/ruby-advisory-db/blob/master/gems/activestorage/CVE-2026-33658.yml","tags":["x_refsource_MISC","Third Party Advisory","advisory","web","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33658","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-p9fm-f462-ggrg"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33658.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-33658","tags":["advisory"]},{"url":"https://github.com/rails/rails","tags":["package"]},{"url":"https://ubuntu.com/security/CVE-2026-33658","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-33658","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-33658","title":"Rails Active Storage has a possible DoS vulnerability in proxy mode via multi-range requests","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.","status":"published","published":"2026-03-26T21:03:25.319Z","modified":"2026-03-30T11:42:24.885Z","cvss":[{"version":"4.0","score":2.3,"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","level":"low","assessor":"cna"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T14:20:08.009733Z"}],"euvd":[{"id":"EUVD-2026-16426","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.","status":"published","published":"2026-03-26T21:03:25Z","modified":"2026-03-30T11:42:24Z","cvss":[{"version":"4.0","score":2.3,"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","level":"low"}],"updated_at":"2026-11-02T19:25:26.376466Z"}],"ghsa":[{"id":"GHSA-p9fm-f462-ggrg","title":"Rails Active Storage has a possible DoS vulnerability in proxy mode via multi-range requests","description":"### Impact\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.\n\n### Releases\nThe fixed releases are available at the normal locations.\n\n### Credit\nThis issue was responsibly reported by Hackerone researcher [thwin_htet](https://hackerone.com/thwin_htet).","status":"published","published":"2026-03-25T21:04:50Z","modified":"2026-05-06T21:23:03Z","cvss":[{"version":"4.0","score":2.3,"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","level":"low"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T14:40:02.883746Z"}],"nvd":[{"id":"CVE-2026-33658","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.","status":"published","published":"2026-03-26T22:16:29.387Z","modified":"2026-06-17T10:37:52.553Z","cvss":[{"version":"4.0","score":2.3,"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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T14:12:11.678711Z"}],"osv":[{"id":"CVE-2026-33658","title":"Rails Active Storage has a possible DoS vulnerability in proxy mode via multi-range requests","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.","status":"published","published":"2026-03-26T21:03:25.319Z","modified":"2026-10-28T02:30:31.038527121Z","cvss":[{"version":"4.0","score":2.3,"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","level":"low"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T15:45:01.896044Z"},{"id":"DEBIAN-CVE-2026-33658","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 Active 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.","status":"published","published":"2026-03-26T22:16:29.387Z","modified":"2026-10-08T15:00:07.645392987Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:45:54.587575Z"},{"id":"GHSA-p9fm-f462-ggrg","title":"Rails Active Storage has a possible DoS vulnerability in proxy mode via multi-range requests","description":"### Impact\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.\n\n### Releases\nThe fixed releases are available at the normal locations.\n\n### Credit\nThis issue was responsibly reported by Hackerone researcher [thwin_htet](https://hackerone.com/thwin_htet).","status":"published","published":"2026-03-25T21:04:50Z","modified":"2026-09-10T03:50:40.184257972Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"},{"version":"4.0","score":2.3,"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","level":"low"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T15:46:52.891208Z"},{"id":"UBUNTU-CVE-2026-33658","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 Active 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.","status":"published","published":"2026-03-26T22:16:00Z","modified":"2026-10-17T12:58:10.957134839Z","cvss":[{"version":"4.0","score":2.3,"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","level":"low"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T16:56:16.036833Z"}]}}