{"id":"CVE-2026-67414","summary":"RabbitMQ AMQP 1.0 parser: amplification memory-exhaustion DoS via zero-width array aggregation","details":"RabbitMQ is a messaging and streaming broker. From 4.0.0 until 4.0.24, 4.1.15, 4.2.10, and 4.3.4, deps/amqp10_common/src/amqp10_binary_parser.erl materializes each element of AMQP 1.0 arrays whose shared constructor has zero width, while limiting only the number of elements in each array and not the aggregate arrays in a frame. After completing SASL authentication, a low-privilege client can send an ordinary frame containing many individually permitted arrays, causing a small frame to expand into a very large reader-process heap before later frame validation or authorization. Because deps/rabbit/src/rabbit_amqp_reader.erl clears the pre-authentication max_heap_size guard after login, repeated or concurrent frames can trigger the node-wide memory alarm, block publishers, or exhaust broker memory. This issue is fixed in versions 4.0.24, 4.1.15, 4.2.10, and 4.3.4.","aliases":["GHSA-w6mq-4qpx-v7mh"],"modified":"2026-10-15T02:47:37.155388195Z","published":"2026-10-14T16:04:07.449Z","database_specific":{"unresolved_ranges":[{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"4.0.0"},{"fixed":"4.0.24"},{"introduced":"4.1.0"},{"fixed":"4.1.15"},{"introduced":"4.2.0"},{"fixed":"4.2.10"}]}],"cna_assigner":"GitHub_M","cwe_ids":["CWE-400","CWE-770"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67414.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67414.json"},{"type":"FIX","url":"https://github.com/rabbitmq/rabbitmq-server/commit/3f0f67dfb7c4390e3cbfa25ab3ee19dcb0845bd4"},{"type":"WEB","url":"https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.4"},{"type":"ADVISORY","url":"https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-w6mq-4qpx-v7mh"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-67414"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/rabbitmq/rabbitmq-server","events":[{"introduced":"1929eeadf9b2bac12c5434fb56884ef27370580e"},{"fixed":"d5186e66e056960f58e2d0fbee2fcc66e1ed6fb9"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"4.3.0"},{"fixed":"4.3.4"}]}}],"versions":["v4.3.3","v4.3.2","v4.3.1","v4.3.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-67414.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}]}