{"id":"UBUNTU-CVE-2026-126072","details":"Action Pack is a framework for handling and responding to web requests. Prior to 8.1.4.1 and 8.0.5.2, ActionController::Live::Buffer#close pushes its end-of-stream marker onto the response's bounded queue while it holds the buffer's monitor. When the client has stopped reading and the queue is full, the push blocks, and Buffer#abort, which runs when the client disconnects or a write times out, waits indefinitely for the same monitor. Each such response could permanently hold a web server thread and its ActionController::Live thread, possibly resulting in a DoS vulnerability through thread exhaustion. Applications that stream responses with ActionController::Live, including send_stream, are affected. Applications that serve large files through Active Storage proxy mode are exposed to unauthenticated clients. This issue is fixed in versions 8.1.4.1 and 8.0.5.2.","modified":"2026-11-12T23:46:38.550387457Z","published":"2026-11-12T00:00:00Z","upstream":["CVE-2026-126072"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-126072"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-126072"},{"type":"REPORT","url":"https://github.com/rails/rails/security/advisories/GHSA-rwvh-fw6r-pwvp"},{"type":"REPORT","url":"https://github.com/rails/rails/commit/27ad18ed5900dee28ba20e9c6fc718ff751fa215"},{"type":"REPORT","url":"https://github.com/rails/rails/commit/ccbfc09690fef05fdd2a9969c917a71b92cc98fc"},{"type":"REPORT","url":"https://github.com/rails/rails/releases/tag/v8.0.5.2"},{"type":"REPORT","url":"https://github.com/rails/rails/releases/tag/v8.1.4.1"}],"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_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_name":"ruby-activerecord"},{"binary_version":"2:4.2.6-1ubuntu0.1~esm2","binary_name":"ruby-activesupport"},{"binary_version":"2:4.2.6-1ubuntu0.1~esm2","binary_name":"ruby-rails"},{"binary_version":"2:4.2.6-1ubuntu0.1~esm2","binary_name":"ruby-railties"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-126072.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_version":"2:4.2.10-0ubuntu4+esm2","binary_name":"rails"},{"binary_name":"ruby-actionmailer","binary_version":"2:4.2.10-0ubuntu4+esm2"},{"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_name":"ruby-activejob","binary_version":"2:4.2.10-0ubuntu4+esm2"},{"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_name":"ruby-activesupport","binary_version":"2:4.2.10-0ubuntu4+esm2"},{"binary_name":"ruby-rails","binary_version":"2:4.2.10-0ubuntu4+esm2"},{"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-2026-126072.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_name":"rails","binary_version":"2:5.2.3+dfsg-3ubuntu0.1~esm1"},{"binary_version":"2:5.2.3+dfsg-3ubuntu0.1~esm1","binary_name":"ruby-actioncable"},{"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_version":"2:5.2.3+dfsg-3ubuntu0.1~esm1","binary_name":"ruby-actionview"},{"binary_version":"2:5.2.3+dfsg-3ubuntu0.1~esm1","binary_name":"ruby-activejob"},{"binary_version":"2:5.2.3+dfsg-3ubuntu0.1~esm1","binary_name":"ruby-activemodel"},{"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_version":"2:5.2.3+dfsg-3ubuntu0.1~esm1","binary_name":"ruby-railties"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-126072.json"}},{"package":{"name":"rails","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/rails?arch=source&distro=esm-apps%2Fjammy"},"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"],"ecosystem_specific":{"binaries":[{"binary_name":"rail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