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    CVE-2026-66080

    RabbitMQ is a messaging and streaming broker. Prior to versions 4.1.11, 4.2.6, and 4.3.0, validate_partitions only checks that the requested partition count is at least 1, with no upper bound. A large count such as lists:seq(0, 500000000) allocates roughly 8GB. Preconditions include The rabbitmq_stream_management plugin must be enabled. The caller needs the management tag and access to the target vhost.. This issue is fixed in versions 4.1.11, 4.2.6, and 4.3.0.

    Published:Sep 23, 2026
    Last Modified:Oct 19, 2026
    EPS:Sep 23, 2026
    EPSS Score:0.00278
    CVSS Score:4.9

    Affected Products

    Vendor
    Broadcom
    Product
    Rabbitmq Server
    Vendor
    Rabbitmq
    Product
    Rabbitmq-server
    Vendor
    Redhat
    Product
    Hummingbird

    Exploits

    No exploit reference

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    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