{"id":"CVE-2026-67418","title":"RabbitMQ is a messaging and streaming broker","summary":"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 th…","severity":"medium","cvss":5.3,"cvssVector":"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","cwe":["CWE-248","CWE-1286"],"vendor":"rabbitmq","product":"rabbitmq-server","affected":["rabbitmq-server >= 3.13.0, < 3.13.19","rabbitmq-server >= 4.0.0, < 4.0.24","rabbitmq-server >= 4.1.0, < 4.1.15","rabbitmq-server >= 4.2.0, < 4.2.10","rabbitmq-server >= 4.3.0, < 4.3.5"],"patched":["hardened_images"],"published":"2026-10-14","updated":"2026-10-16","sourceUpdated":"2026-10-16T16:00:33.533","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-67418","references":[{"url":"https://github.com/rabbitmq/rabbitmq-server/commit/4639a4318c72a0660e4bc014767fad70ce288fbc","label":"security-advisories@github.com"},{"url":"https://github.com/rabbitmq/rabbitmq-server/commit/908f944a1d581d10774f8d6d0dcf2a1a713779fb","label":"security-advisories@github.com"},{"url":"https://github.com/rabbitmq/rabbitmq-server/pull/17035","label":"security-advisories@github.com"},{"url":"https://github.com/rabbitmq/rabbitmq-server/pull/17287","label":"security-advisories@github.com"},{"url":"https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.5","label":"security-advisories@github.com"},{"url":"https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-jv99-v328-mvmm","label":"security-advisories@github.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-67418.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-67418"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2552635"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-67418"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-67418"},{"url":"https://access.redhat.com/errata/RHSA-2026:82703"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.004,"epssPercentile":0.34088,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-14T17:52:54.774490Z"},"cvssSource":"cna","scores":{"cna":5.3,"vendor":4.3},"ingestedAt":"2026-10-14T17:44:53.676Z","slug":"CVE-2026-67418","body":"## Overview\n\nRabbitMQ 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **RHSA-2026:82703** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-10-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:82703)\n- **Red Hat VEX** · Moderate · affected: Red Hat Hardened Images, Red Hat OpenStack Platform 13 (Queens), Red Hat OpenStack Platform 16.2, Red Hat OpenStack Platform 17.1, Red Hat OpenStack Platform 18.0 · no fix planned: Red Hat OpenStack Platform 13 (Queens), Red Hat OpenStack Platform 16.2, Red Hat OpenStack Platform 17.1, Red Hat Hardened Images, … · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-67418.json)","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":221778,"id":"CVE-2026-67418","ts":1792035529465,"field":"cvss","old":null,"new":"5.3"},{"seq":221777,"id":"CVE-2026-67418","ts":1792035529465,"field":"severity","old":"none","new":"medium"}]}