Description
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: 2026-11-04
Score: 8.7 High
EPSS: n/a
KEV: No
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Remediation

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Tracking

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History

Wed, 04 Nov 2026 13:00:00 +0000

Type Values Removed Values Added
First Time appeared Apache
Apache zookeeper
Vendors & Products Apache
Apache zookeeper

Wed, 04 Nov 2026 12:30:00 +0000

Type Values Removed Values Added
References

Wed, 04 Nov 2026 11:00:00 +0000

Type Values Removed Values Added
Description 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.
Title Apache ZooKeeper: Unauthenticated persistent denial of service via unvalidated quota-node data and paths crashing the transaction-apply thread
Weaknesses CWE-755
References
Metrics cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


Subscriptions

Apache Zookeeper
cve-icon MITRE

Status: PUBLISHED

Assigner: apache

Published:

Updated: 2026-11-04T11:09:29.613Z

Reserved: 2026-09-25T17:44:40.392Z

Link: CVE-2026-100300

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-11-04T11:17:06.873

Modified: 2026-11-04T12:17:05.170

Link: CVE-2026-100300

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-11-04T12:45:13Z

Weaknesses
  • CWE-755

    Improper Handling of Exceptional Conditions