UBUNTU-CVE-2026-111821

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    UBUNTU-CVE-2026-111821

    Published: 4 Nov 2026Last Modified: 5 Nov 2026
    Upstream:
    CVE-2026-111821

    Summary:

    Details: Improper input validation vulnerability in Apache ActiveMQ, Apache ActiveMQ KahaDB. A user can create a durable subscription with a clientId and subscription name that have a combined length > 65,535 (while separately being shorter) on a broker using KahaDB which can cause the broker to shutdown and be unrecoverable. This issue affects Apache ActiveMQ: from 6.0.0 before 6.3.3, before 5.19.12; Apache ActiveMQ KahaDB: from 6.0.0 before 6.3.3, before 5.19.12. Users are recommended to upgrade to version 6.4.0, 6.3.3 or 5.19.12, which fixes the issue.

    References: https://ubuntu.com/security/CVE-2026-111821, https://www.cve.org/CVERecord?id=CVE-2026-111821, https://lists.apache.org/thread/p8gxq66lmztkrls74wkz3xh9chqd0pwl, http://www.openwall.com/lists/oss-security/2026/11/03/19

    Affected packages

    Package

    Name: activemq

    Purl: pkg:deb/ubuntu/activemq?arch=source&distro=esm-apps%2Fxenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    5.6.0+dfsg1-4+deb8u1ubuntu1
    5.6.0+dfsg1-5

    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
    UBUNTU-CVE-2026-111821 | CVE-DB