{"schemaVersion":3,"id":"CVE-2026-67418","aliases":["DEBIAN-CVE-2026-67418","UBUNTU-CVE-2026-67418"],"status":"published","duplicateOf":null,"title":null,"description":"RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.19, 4.0.24, 4.1.15, 4.2.10, and 4.3.5, the MQTT 5 parser in deps/rabbitmq_mqtt/src/rabbit_mqtt_packet.erl accepts Request-Problem-Information on PUBLISH packets even though the property is valid only for CONNECT. An authenticated publisher with topic write permission can cause the broker to store and route that inapplicable property to a separately authenticated matching subscriber. When the subscriber path serializes the outbound PUBLISH, serialise_prop/2 has no matching clause, and the uncontained function_clause exception closes the victim MQTT or Web MQTT connection. The publisher connection and broker remain available, and queued replay, retained-message persistence, and broker-wide denial of service were not established. This issue is fixed in versions 3.13.19, 4.0.24, 4.1.15, 4.2.10, and 4.3.5.","dates":{"published":"2026-10-14T16:07:29.752Z","modified":"2026-10-14T17:53:16.254Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":5.3,"severity":"medium","version":"4.0","versionLabel":"v4.0","source":"CVE.org","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":5.3,"severity":"medium","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"NVD","score":5.3,"severity":"medium","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/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":5.3,"severity":"medium","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/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":5.3,"severity":"medium","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","exploitability":null,"impact":null,"computed":true}]},"epss":{"probability":0.004,"percentile":0.32747,"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":0.004,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.004,"percentile":0.32747}],"last30":[{"date":"2026-10-15T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.004,"percentile":0.32747}]},"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-248","name":"Uncaught Exception","description":"An exception is thrown from a function, but it is not caught.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/248.html"},{"id":"CWE-1286","name":"Improper Validation of Syntactic Correctness of Input","description":"The product receives input that is expected to be well-formed - i.e., to comply with a certain syntax - but it does not validate or incorrectly validates that the input complies with the syntax.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/1286.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":"≥ 3.13.0, < 3.13.19","noFixRecorded":false,"fixedIn":null},{"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, < 4.3.5","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.13.0, < 3.13.19 | ≥ 4.0.0, < 4.0.24 | ≥ 4.1.0, < 4.1.15 | ≥ 4.2.0, < 4.2.10 | ≥ 4.3.0, < 4.3.5","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-jv99-v328-mvmm","label":"github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-jv99-v328-mvmm","hostname":"github.com","tags":["X Refsource CONFIRM","REPORT"]},{"url":"https://github.com/rabbitmq/rabbitmq-server/pull/17035","label":"github.com/rabbitmq/rabbitmq-server/pull/17035","hostname":"github.com","tags":["X Refsource MISC","REPORT"]},{"url":"https://github.com/rabbitmq/rabbitmq-server/pull/17287","label":"github.com/rabbitmq/rabbitmq-server/pull/17287","hostname":"github.com","tags":["X Refsource MISC","REPORT"]},{"url":"https://github.com/rabbitmq/rabbitmq-server/commit/4639a4318c72a0660e4bc014767fad70ce288fbc","label":"github.com/rabbitmq/rabbitmq-server/commit/4639a4318c72a0660e4bc014767fad70ce288fbc","hostname":"github.com","tags":["X Refsource MISC","REPORT"]},{"url":"https://github.com/rabbitmq/rabbitmq-server/commit/908f944a1d581d10774f8d6d0dcf2a1a713779fb","label":"github.com/rabbitmq/rabbitmq-server/commit/908f944a1d581d10774f8d6d0dcf2a1a713779fb","hostname":"github.com","tags":["X Refsource MISC","REPORT"]},{"url":"https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.5","label":"github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.5","hostname":"github.com","tags":["X Refsource MISC","REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-67418","label":"security-tracker.debian.org/tracker/CVE-2026-67418","hostname":"security-tracker.debian.org","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-67418","label":"ubuntu.com/security/CVE-2026-67418","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-67418","label":"www.cve.org/CVERecord?id=CVE-2026-67418","hostname":"www.cve.org","tags":["REPORT"]}],"lineage":{"upstream":[],"downstream":["RHSA-2026:82703"],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-10-14T16:07:29.752Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-10-14T17:53:16.254Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":21,"level":"low","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T22:42:59.733Z","stale":false,"partial":false}}