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    CVE-2026-100300

    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.

    Published:Nov 4, 2026
    Last Modified:Nov 4, 2026
    EPS:Nov 4, 2026
    EPSS Score:
    CVSS Score:8.7

    Affected Products

    Vendor
    Apache
    Product
    Zookeeper

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-100302 (CVSS 7.1) — Allocation of Resources Without Limits or Throttling in the multiRead request handler of Apache ZooKeeper allo…
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    CVE-2026-100252 (CVSS 8.6) — Improper Authorization vulnerability in Apache ZooKeeper. When SASL authentication is enabled on the client p…
    CVE-2026-100235 (CVSS 6) — Incorrect authorization due to a time-of-check to time-of-use (TOCTOU) race condition in the setACL request ha…
    CVE-2026-84501 (CVSS 5.3) — An unauthenticated attacker can inject arbitrary fake log lines into Apache ZooKeeper's operational log by sen…
    CVE-2026-84439 (CVSS 5.3) — When audit logging is enabled (zookeeper.audit.enable=true), an unauthenticated attacker can inject arbitrary …
    CVE-2026-79993 (CVSS 7.5) — The `deleteContainer` opcode (0x14/20) is processed without verifying the caller's ACL permissions, allowing a…
    CVE-2026-59969 (CVSS 7.5) — Apache ZooKeeper quorum TLS fails to enforce peer hostname verification in FIPS-mode deployments. When sslQuor…
    CVE-2026-59739 (CVSS 7.5) — Information disclosure via SetWatches reconnect replay in Apache ZooKeeper due to missing ACL check. An attack…
    CVE-2026-24308 (CVSS 7.5) — Improper handling of configuration values in ZKConfig in Apache ZooKeeper 3.8.5 and 3.9.4 on all platforms all…

    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