{"id":"CVE-2026-67235","revision":"aa4c4cd1df0e45d1827e827d68bc98cf","records":[{"revision":"aa4c4cd1df0e45d1827e827d68bc98cf","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-67235","aliases":[],"title":"RabbitMQ: AMQP 0-9-1 body assembly never validates accumulated size","description":"RabbitMQ is a messaging and streaming broker. Prior to versions 4.3.0, 4.2.6, 4.1.11, 4.0.20, and 3.13.15, The content-header BodySize (a uint64) was stored without validation against max_message_size. The size check ran only when assembly completed. By declaring body_size = 2^63-1 and then streaming fragments, a client ensured that check_msg_size never fired, so the accumulated body size went unbounded. A reader process accumulates memory until the memory alarm fires, degrading all publishers cluster-wide, or until the node runs out of memory. The memory alarm provides only partial mitigation, since it is reactive rather than preventive. AMQP 0-9-1 is the most widely used protocol, and any publisher can trigger this condition. Preconditions include Any authenticated AMQP 0-9-1 client with publish permission can exploit this.. This issue is fixed in versions 4.3.0, 4.2.6, 4.1.11, 4.0.20, and 3.13.15.","state":0,"publishedAt":"2026-09-23T20:36:37.508+00:00","modifiedAt":"2026-09-24T15:04:51.023+00:00","affected":[{"ecosystem":"Vendor product","name":"rabbitmq-server","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"rabbitmq\",\n                    \"product\": \"rabbitmq-server\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 4.2.0, < 4.2.6\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 4.1.0, < 4.1.11\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 4.0.0, < 4.0.20\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 3.13.0, < 3.13.15\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":7.1,"severity":"HIGH"}],"references":["https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-q8g2-pc7m-m3jw","https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6","https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-67235","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-67235","identifiers":["CVE-2026-67235"]},"retained":false,"historicalAffected":[]}],"coverage":[]}