UBUNTU-CVE-2026-100300

    Dashboard / Vulnerabilities / UBUNTU-CVE-2026-100300

    UBUNTU-CVE-2026-100300

    Published: 5 Nov 2026Last Modified: 6 Nov 2026
    Upstream:
    CVE-2026-100300

    Summary:

    Details: Improper handling of exceptional conditions in the quota subsystem of Apache ZooKeeper allows an attacker able to write under the /zookeeper/quota subtree — unauthenticated on default deployments, where that subtree is world-writable — to crash the server's critical request-processing thread and render the on-disk data directory permanently unbootable. This issue affects Apache ZooKeeper up to and including 3.9.6. Users are recommended to upgrade to version 3.8.8 or 3.9.7, which fixes the issue.

    References: https://ubuntu.com/security/CVE-2026-100300, https://www.cve.org/CVERecord?id=CVE-2026-100300, https://lists.apache.org/thread.html/09pgg7rcpzz44noxgtvpzstwt8fmvsb0, http://www.openwall.com/lists/oss-security/2026/11/03/11

    Affected packages

    Package

    Name: zookeeper

    Purl: pkg:deb/ubuntu/zookeeper?arch=source&distro=esm-infra-legacy%2Ftrusty

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    3.4.5+dfsg-1
    3.4.5+dfsg-1ubuntu0.1~esm1
    3.4.5+dfsg-1ubuntu0.1~esm3

    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-2026-100300 | CVE-DB