{"id":"CVE-2026-67419","title":"RabbitMQ is a messaging and streaming broker","summary":"RabbitMQ is a messaging and streaming broker. Prior to 4.3.5, an authenticated user who can bind a queue to a topic exchange and publish to it can use consecutive # segments in a binding key to make both topic matchers revisit the same t…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-407","CWE-1333"],"vendor":"broadcom","product":"rabbitmq_server","affected":["rabbitmq_server >= 4.3.0, < 4.3.5"],"patched":["rabbitmq_server 4.3.5"],"published":"2026-09-25","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:46:33.137","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-67419","references":[{"url":"https://github.com/rabbitmq/rabbitmq-server/commit/c5ed7c4e97e02be688730803604cc7a88dbe4864","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-h964-v5mf-22cq","label":"security-advisories@github.com"},{"url":"https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-h964-v5mf-22cq","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-67419.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-67419"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2541534"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-67419"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-67419"},{"url":"https://access.redhat.com/errata/RHSA-2026:67552"}],"tags":["nvd","cve.org","exploit-available","csaf","vex","red-hat"],"epss":0.00373,"epssPercentile":0.31046,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-25T17:01:28.563642Z"},"scores":{"nvd":6.5,"cna":7.1,"vendor":6.5},"ingestedAt":"2026-09-25T17:13:14.018Z","slug":"CVE-2026-67419","body":"## Overview\n\nRabbitMQ is a messaging and streaming broker. Prior to 4.3.5, an authenticated user who can bind a queue to a topic exchange and publish to it can use consecutive # segments in a binding key to make both topic matchers revisit the same trie-node and routing-key-suffix states without memoization. The matcher materializes duplicate destinations before deduplication, causing combinatorial CPU work and memory pressure that can disrupt routing for all tenants. This vulnerability is fixed in 4.3.5.\n\n## Affected\n\n- `rabbitmq_server >= 4.3.0, < 4.3.5`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `rabbitmq_server 4.3.5`\n\n## Vendor advisories\n\n- **RHSA-2026:67552** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:67552)\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 2026-10-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-67419.json)","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":230360,"id":"CVE-2026-67419","ts":1793130920362,"field":"cvss","old":"7.1","new":"6.5"},{"seq":230359,"id":"CVE-2026-67419","ts":1793130920362,"field":"severity","old":"high","new":"medium"},{"seq":211109,"id":"CVE-2026-67419","ts":1790360107433,"field":"exploit_available","old":"false","new":"true"}]}