{"schemaVersion":3,"id":"CVE-2026-67414","aliases":["DEBIAN-CVE-2026-67414","UBUNTU-CVE-2026-67414"],"status":"published","duplicateOf":null,"title":null,"description":"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.","dates":{"published":"2026-10-14T16:04:07.449Z","modified":"2026-10-14T16:04:07.449Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":6,"severity":"medium","version":"4.0","versionLabel":"v4.0","source":"CVE.org","vector":"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","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":6,"severity":"medium","vector":"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","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"NVD","score":6,"severity":"medium","vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Debian","score":6,"severity":"medium","vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","exploitability":null,"impact":null,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Ubuntu","score":6,"severity":"medium","vector":"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","exploitability":null,"impact":null,"computed":true}]},"epss":{"probability":0.00543,"percentile":0.44467,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[{"date":"2026-10-15T00:00:00.000Z","score":0.00543,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00543,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00543,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00543,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00543,"percentile":0.44467}],"last30":[{"date":"2026-10-15T00:00:00.000Z","score":0.00543,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00543,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00543,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00543,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00543,"percentile":0.44467}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-400","name":"Uncontrolled Resource Consumption","description":"The product does not properly control the allocation and maintenance of a limited resource.","type":"weakness","status":"Draft","abstraction":"Class","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/400.html"},{"id":"CWE-770","name":"Allocation of Resources Without Limits or Throttling","description":"The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/770.html"}],"affected":[{"vendor":"debian","product":"rabbitmq-server","name":"rabbitmq-server","label":"rabbitmq-server","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/rabbitmq-server","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null},{"text":"< 4.3.6-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"All versions (No fix recorded) | < 4.3.6-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"rabbitmq-server","name":"rabbitmq-server","label":"rabbitmq-server","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/rabbitmq-server","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"rabbitmq","product":"rabbitmq-server","name":"rabbitmq-server","label":"rabbitmq-server","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 4.0.0, < 4.0.24","noFixRecorded":false,"fixedIn":null},{"text":"≥ 4.1.0, < 4.1.15","noFixRecorded":false,"fixedIn":null},{"text":"≥ 4.2.0, < 4.2.10","noFixRecorded":false,"fixedIn":null},{"text":"≥ 4.3.0, < 4.3.4","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 4.0.0, < 4.0.24 | ≥ 4.1.0, < 4.1.15 | ≥ 4.2.0, < 4.2.10 | ≥ 4.3.0, < 4.3.4","eol":null,"hubHref":"/vendor/rabbitmq/rabbitmq-server"}],"affectedCount":3,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-w6mq-4qpx-v7mh","label":"github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-w6mq-4qpx-v7mh","hostname":"github.com","tags":["X Refsource CONFIRM","REPORT"]},{"url":"https://github.com/rabbitmq/rabbitmq-server/commit/3f0f67dfb7c4390e3cbfa25ab3ee19dcb0845bd4","label":"github.com/rabbitmq/rabbitmq-server/commit/3f0f67dfb7c4390e3cbfa25ab3ee19dcb0845bd4","hostname":"github.com","tags":["X Refsource MISC","REPORT"]},{"url":"https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.4","label":"github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.4","hostname":"github.com","tags":["X Refsource MISC","REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-67414","label":"security-tracker.debian.org/tracker/CVE-2026-67414","hostname":"security-tracker.debian.org","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-67414","label":"ubuntu.com/security/CVE-2026-67414","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-67414","label":"www.cve.org/CVERecord?id=CVE-2026-67414","hostname":"www.cve.org","tags":["REPORT"]}],"lineage":{"upstream":[],"downstream":["RHSA-2026:82703"],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-10-14T16:04:07.449Z","label":"Published","detail":"Vulnerability first disclosed.","source":null}],"risk":{"score":24,"level":"low","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T12:20:18.012Z","stale":false,"partial":false}}