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    CVE-2026-67419

    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 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.

    Published:Sep 25, 2026
    Last Modified:Oct 16, 2026
    EPS:Sep 25, 2026
    EPSS Score:0.0033
    CVSS Score:6.5

    Affected Products

    Vendor
    Broadcom
    Product
    Rabbitmq Server
    Vendor
    Rabbitmq
    Product
    Rabbitmq-server

    Exploits

    https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-h964-v5mf-22cqhttps://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-h964-v5mf-22cq

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-492 Regular Expression Exponential Blowup

    Related CVEs

    CVE-2026-67420 (CVSS 2.3) — 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, Ra…
    CVE-2026-67421 (CVSS 4.5) — 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, Ra…
    CVE-2026-67408 (CVSS 7.1) — RabbitMQ is a messaging and streaming broker. From 4.1.0 until 4.3.3, 4.2.9, and 4.1.11, Stream Management Sup…
    CVE-2026-67406 (CVSS 4.6) — RabbitMQ is a messaging and streaming broker. From 4.0.0 until 4.3.3, 4.2.9, 4.1.14, and 4.0.23, Shovel does n…
    CVE-2026-67410 (CVSS 8.2) — RabbitMQ is a messaging and streaming broker. From 4.2.0 until 4.3.3 and 4.2.9, OAuth2 Client Secret Exposed v…
    CVE-2026-67227 (CVSS 5.9) — RabbitMQ is a messaging and streaming broker. From 4.0.0 until 4.0.22 and 4.1.14 and 4.2.7 and 4.3.1, Atom exh…
    CVE-2026-67407 (CVSS 5.1) — RabbitMQ is a messaging and streaming broker. From 4.0.0 until 4.3.3 and 4.2.9 and 4.1.14 and 4.0.23, Incomple…
    CVE-2026-67226 (CVSS 6.9) — RabbitMQ is a messaging and streaming broker. From 4.0.0 until 4.0.22 and 4.1.14 and 4.2.7, Admin-only atom ex…
    CVE-2026-67411 (CVSS 6) — RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.18, 4.0.23, 4.1.14, 4.2.9, and 4.3.3, nat…
    CVE-2026-67413 (CVSS 6) — RabbitMQ is a messaging and streaming broker. From 4.0.0 until 4.0.23, 4.1.14, 4.2.9, and 4.3.3, the optional …

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High