CVE-2026-100300: Apache ZooKeeper: Unauthenticated persistent denial of service via unvalidated quota-node data and paths crashing the transaction-apply thread
Apache Software Foundation · Apache ZooKeeper
Vendor fix available · Affected: Apache Software Foundation Apache ZooKeeper · Exploitation: not established
ExploitationNot established
Not in CISA KEV as of catalogue 2026.11.04 (4 Nov)
- In CISA KEV: not seen
- Exploited (reported): not seen
- Scanning observed: not seen
- Proof of concept public: not seen
- Not establishedNothing in the sources we check
No EPSS score yet. The score appears once FIRST publishes it.
DescriptionNVD
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.
Coverage1 article · 1 outlet
First in our coverage: SecurityOnline, 5 Nov.
- Apache fixes flaws across ZooKeeper, OpenOffice and ActiveMQSecurityOnline · first in our coverage · mentions it in passing
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