{"id":"CVE-2026-126072","state":"PUBLISHED","title":"Action Pack: Possible DoS vulnerability in Action Controller Live streaming","description":"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.","publishedAt":"2026-11-10T20:44:52.734Z","updatedAt":"2026-11-10T20:44:52.734Z","severity":{"score":5.9,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["rails rails"],"affected":[{"vendor":"rails","product":"rails","versions":[{"version":">= 8.1, < 8.1.4.1","status":"affected"},{"version":"< 8.0.5.2","status":"affected"}]}],"references":["https://github.com/rails/rails/security/advisories/GHSA-rwvh-fw6r-pwvp","https://github.com/rails/rails/commit/27ad18ed5900dee28ba20e9c6fc718ff751fa215","https://github.com/rails/rails/commit/ccbfc09690fef05fdd2a9969c917a71b92cc98fc","https://github.com/rails/rails/releases/tag/v8.0.5.2","https://github.com/rails/rails/releases/tag/v8.1.4.1"],"weaknesses":["CWE-833"],"ingestedAt":"2026-11-10T21:04:04.600Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/126xxx/CVE-2026-126072.json","commit":"cd87b009c69cb95c2b9f35c35b81e00a7c52601d","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-126072","state":"PUBLISHED","datePublished":"2026-11-10T20:44:52.734Z","dateUpdated":"2026-11-10T20:44:52.734Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-11-10T17:07:43.284Z"},"containers":{"cna":{"title":"Action Pack: Possible DoS vulnerability in Action Controller Live streaming","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"rails","product":"rails","versions":[{"version":">= 8.1, < 8.1.4.1","status":"affected"},{"version":"< 8.0.5.2","status":"affected"}]}],"references":[{"url":"https://github.com/rails/rails/security/advisories/GHSA-rwvh-fw6r-pwvp","name":"https://github.com/rails/rails/security/advisories/GHSA-rwvh-fw6r-pwvp","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/rails/rails/commit/27ad18ed5900dee28ba20e9c6fc718ff751fa215","name":"https://github.com/rails/rails/commit/27ad18ed5900dee28ba20e9c6fc718ff751fa215","tags":["x_refsource_MISC"]},{"url":"https://github.com/rails/rails/commit/ccbfc09690fef05fdd2a9969c917a71b92cc98fc","name":"https://github.com/rails/rails/commit/ccbfc09690fef05fdd2a9969c917a71b92cc98fc","tags":["x_refsource_MISC"]},{"url":"https://github.com/rails/rails/releases/tag/v8.0.5.2","name":"https://github.com/rails/rails/releases/tag/v8.0.5.2","tags":["x_refsource_MISC"]},{"url":"https://github.com/rails/rails/releases/tag/v8.1.4.1","name":"https://github.com/rails/rails/releases/tag/v8.1.4.1","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":5.9,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-833","lang":"en","description":"CWE-833: Deadlock","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-11-10T20:44:52.734Z"},"source":{"advisory":"GHSA-rwvh-fw6r-pwvp","discovery":"UNKNOWN"}}}}}