{"id":"CVE-2026-33174","aliases":["DEBIAN-CVE-2026-33174","EUVD-2026-14628","GHSA-r46p-8f7g-vvvg","UBUNTU-CVE-2026-33174"],"status":"published","title":"Rails Active Storage has a possible DoS vulnerability when in proxy mode via 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, 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.","severity":{"version":"4.0","score":6.6,"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","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00635,"percentile":0.50784,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-789"],"published":"2026-03-23T21:08:54Z","modified":"2026-10-28T02:31:08Z","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.beta1"},{"fixed":"8.1.2.1"}]}]},{"source":"ghsa","ecosystem":"RubyGems","package":"activestorage","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"8.0.0.beta1"},{"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.beta1"},{"fixed":"8.1.2.1"}]}],"versions":["8.1.0","8.1.0.beta1","8.1.0.rc1","8.1.1","8.1.2"]},{"source":"osv","ecosystem":"RubyGems","package":"activestorage","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"8.0.0.beta1"},{"fixed":"8.0.4.1"}]}],"versions":["8.0.0","8.0.0.1","8.0.0.beta1","8.0.0.rc1","8.0.0.rc2","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":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:6.1.7.3+dfsg-2build1","2:6.1.7.3+dfsg-3"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"rails","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:6.1.7.3+dfsg-7","2:7.2.2.1+dfsg-7"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"rails","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:7.2.3+dfsg-2","2:7.2.3.2+dfsg-2"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"rails","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:7.2.2.1+dfsg-7","2:7.2.2.2+dfsg-2","2:7.2.3+dfsg-2"]}],"products":[{"vendor":"rails","product":"activestorage"},{"vendor":"rubyonrails","product":"rails"}],"references":[{"url":"https://github.com/rails/rails/security/advisories/GHSA-r46p-8f7g-vvvg","tags":["x_refsource_CONFIRM","Vendor Advisory","advisory","web","report"]},{"url":"https://github.com/rails/rails/commit/2cd933c366b777f873d4d590127da2f4a25e4ba5","tags":["x_refsource_MISC","Patch","fix","web","report"]},{"url":"https://github.com/rails/rails/commit/42012eaaa88dfc7d0030161b2bc8074a7bbce92a","tags":["x_refsource_MISC","Patch","fix","web","report"]},{"url":"https://github.com/rails/rails/commit/8159a9c3de3f27a2bcf2866b8bf9ceb9075e229b","tags":["x_refsource_MISC","Patch","fix","web","report"]},{"url":"https://github.com/rails/rails/releases/tag/v7.2.3.1","tags":["x_refsource_MISC","Release Notes","web","report"]},{"url":"https://github.com/rails/rails/releases/tag/v8.0.4.1","tags":["x_refsource_MISC","Release Notes","web","report"]},{"url":"https://github.com/rails/rails/releases/tag/v8.1.2.1","tags":["x_refsource_MISC","Release Notes","web","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33174","tags":["advisory"]},{"url":"https://github.com/rubysec/ruby-advisory-db/blob/master/gems/activestorage/CVE-2026-33174.yml","tags":["web"]},{"url":"https://github.com/advisories/GHSA-r46p-8f7g-vvvg"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33174.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-33174","tags":["advisory"]},{"url":"https://github.com/rails/rails","tags":["package"]},{"url":"https://ubuntu.com/security/CVE-2026-33174","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-33174","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-33174","title":"Rails Active Storage has a possible DoS vulnerability when in proxy mode via 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, 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.","status":"published","published":"2026-03-23T23:24:55.594Z","modified":"2026-03-24T13:40:32.031Z","cvss":[{"version":"4.0","score":6.6,"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","level":"medium","assessor":"cna"}],"cwes":["CWE-789"],"updated_at":"2026-11-02T14:20:07.609948Z"}],"euvd":[{"id":"EUVD-2026-14628","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.","status":"published","published":"2026-03-23T23:24:55Z","modified":"2026-03-24T13:40:32Z","cvss":[{"version":"4.0","score":6.6,"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","level":"medium"}],"updated_at":"2026-11-02T19:25:30.317985Z"}],"ghsa":[{"id":"GHSA-r46p-8f7g-vvvg","title":"Rails Active Storage has a possible DoS vulnerability when in proxy mode via Range requests","description":"### Impact\nWhen serving files through Active Storage's `Blobs::ProxyController`, the 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.\n\n### Releases\nThe fixed releases are available at the normal locations.\n\n### Credit\nThis issue was responsibly reported by Hackerone user [pirikara](https://hackerone.com/pirikara)","status":"published","published":"2026-03-23T21:08:54Z","modified":"2026-05-13T16:16:08Z","cvss":[{"version":"4.0","score":6.6,"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","level":"medium"}],"cwes":["CWE-789"],"updated_at":"2026-11-02T14:40:08.003212Z"}],"nvd":[{"id":"CVE-2026-33174","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.","status":"published","published":"2026-03-24T00:16:28.63Z","modified":"2026-06-17T10:37:04.797Z","cvss":[{"version":"4.0","score":6.6,"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/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":"medium","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"}],"cwes":["CWE-789"],"updated_at":"2026-11-02T14:12:10.568062Z"}],"osv":[{"id":"CVE-2026-33174","title":"Rails Active Storage has a possible DoS vulnerability when in proxy mode via 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, 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.","status":"published","published":"2026-03-23T23:24:55.594Z","modified":"2026-10-28T02:31:08.369069002Z","cvss":[{"version":"4.0","score":6.6,"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","level":"medium"}],"cwes":["CWE-789"],"updated_at":"2026-11-02T15:45:01.548715Z"},{"id":"DEBIAN-CVE-2026-33174","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.","status":"published","published":"2026-03-24T00:16:28.63Z","modified":"2026-10-08T15:00:07.645622147Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:54.587575Z"},{"id":"GHSA-r46p-8f7g-vvvg","title":"Rails Active Storage has a possible DoS vulnerability when in proxy mode via Range requests","description":"### Impact\nWhen serving files through Active Storage's `Blobs::ProxyController`, the 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.\n\n### Releases\nThe fixed releases are available at the normal locations.\n\n### Credit\nThis issue was responsibly reported by Hackerone user [pirikara](https://hackerone.com/pirikara)","status":"published","published":"2026-03-23T21:08:54Z","modified":"2026-09-10T03:50:40.647645834Z","cvss":[{"version":"4.0","score":6.6,"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","level":"medium"}],"cwes":["CWE-789"],"updated_at":"2026-11-02T15:46:55.122811Z"},{"id":"UBUNTU-CVE-2026-33174","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.","status":"published","published":"2026-03-24T00:16:00Z","modified":"2026-10-17T12:58:10.539399522Z","cvss":[{"version":"4.0","score":6.6,"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","level":"medium"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T16:56:16.036833Z"}]}}