{"id":"UBUNTU-CVE-2026-33174","details":"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.","modified":"2026-05-20T16:25:28.906619855Z","published":"2026-03-24T00:16:00Z","upstream":["CVE-2026-33174"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-33174"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-33174"},{"type":"REPORT","url":"https://github.com/rails/rails/commit/2cd933c366b777f873d4d590127da2f4a25e4ba5"},{"type":"REPORT","url":"https://github.com/rails/rails/commit/42012eaaa88dfc7d0030161b2bc8074a7bbce92a"},{"type":"REPORT","url":"https://github.com/rails/rails/commit/8159a9c3de3f27a2bcf2866b8bf9ceb9075e229b"},{"type":"REPORT","url":"https://github.com/rails/rails/releases/tag/v7.2.3.1"},{"type":"REPORT","url":"https://github.com/rails/rails/releases/tag/v8.0.4.1"},{"type":"REPORT","url":"https://github.com/rails/rails/releases/tag/v8.1.2.1"},{"type":"REPORT","url":"https://github.com/rails/rails/security/advisories/GHSA-r46p-8f7g-vvvg"}],"affected":[{"package":{"name":"rails","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/rails?arch=source&distro=esm-apps%2Fxenial"},"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"],"ecosystem_specific":{"binaries":[{"binary_name":"rails","binary_version":"2:4.2.6-1ubuntu0.1~esm2"},{"binary_name":"ruby-actionmailer","binary_version":"2:4.2.6-1ubuntu0.1~esm2"},{"binary_version":"2:4.2.6-1ubuntu0.1~esm2","binary_name":"ruby-actionpack"},{"binary_name":"ruby-actionview","binary_version":"2:4.2.6-1ubuntu0.1~esm2"},{"binary_name":"ruby-activejob","binary_version":"2:4.2.6-1ubuntu0.1~esm2"},{"binary_name":"ruby-activemodel","binary_version":"2:4.2.6-1ubuntu0.1~esm2"},{"binary_version":"2:4.2.6-1ubuntu0.1~esm2","binary_name":"ruby-activerecord"},{"binary_name":"ruby-activesupport","binary_version":"2:4.2.6-1ubuntu0.1~esm2"},{"binary_version":"2:4.2.6-1ubuntu0.1~esm2","binary_name":"ruby-rails"},{"binary_name":"ruby-railties","binary_version":"2:4.2.6-1ubuntu0.1~esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33174.json"}},{"package":{"name":"rails","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/rails?arch=source&distro=esm-apps%2Fbionic"},"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"],"ecosystem_specific":{"binaries":[{"binary_name":"rails","binary_version":"2:4.2.10-0ubuntu4+esm2"},{"binary_name":"ruby-actionmailer","binary_version":"2:4.2.10-0ubuntu4+esm2"},{"binary_name":"ruby-actionpack","binary_version":"2:4.2.10-0ubuntu4+esm2"},{"binary_name":"ruby-actionview","binary_version":"2:4.2.10-0ubuntu4+esm2"},{"binary_name":"ruby-activejob","binary_version":"2:4.2.10-0ubuntu4+esm2"},{"binary_name":"ruby-activemodel","binary_version":"2:4.2.10-0ubuntu4+esm2"},{"binary_name":"ruby-activerecord","binary_version":"2:4.2.10-0ubuntu4+esm2"},{"binary_version":"2:4.2.10-0ubuntu4+esm2","binary_name":"ruby-activesupport"},{"binary_version":"2:4.2.10-0ubuntu4+esm2","binary_name":"ruby-rails"},{"binary_name":"ruby-railties","binary_version":"2:4.2.10-0ubuntu4+esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33174.json"}},{"package":{"name":"rails","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/rails?arch=source&distro=esm-apps%2Ffocal"},"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"],"ecosystem_specific":{"binaries":[{"binary_version":"2:5.2.3+dfsg-3ubuntu0.1~esm1","binary_name":"rails"},{"binary_name":"ruby-actioncable","binary_version":"2:5.2.3+dfsg-3ubuntu0.1~esm1"},{"binary_name":"ruby-actionmailer","binary_version":"2:5.2.3+dfsg-3ubuntu0.1~esm1"},{"binary_name":"ruby-actionpack","binary_version":"2:5.2.3+dfsg-3ubuntu0.1~esm1"},{"binary_name":"ruby-actionview","binary_version":"2:5.2.3+dfsg-3ubuntu0.1~esm1"},{"binary_version":"2:5.2.3+dfsg-3ubuntu0.1~esm1","binary_name":"ruby-activejob"},{"binary_name":"ruby-activemodel","binary_version":"2:5.2.3+dfsg-3ubuntu0.1~esm1"},{"binary_name":"ruby-activerecord","binary_version":"2:5.2.3+dfsg-3ubuntu0.1~esm1"},{"binary_version":"2:5.2.3+dfsg-3ubuntu0.1~esm1","binary_name":"ruby-activestorage"},{"binary_version":"2:5.2.3+dfsg-3ubuntu0.1~esm1","binary_name":"ruby-activesupport"},{"binary_name":"ruby-rails","binary_version":"2:5.2.3+dfsg-3ubuntu0.1~esm1"},{"binary_name":"ruby-railties","binary_version":"2:5.2.3+dfsg-3ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33174.json"}},{"package":{"name":"rails","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/rails?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM"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