CVE-2026-100300 · Package
NO FIX YET · SEE WHAT TO DO
Apache ZooKeeper mishandles exceptional conditions in its quota subsystem, so a write under /zookeeper/quota can crash the request-processing thread. The on-disk data directory then cannot be started again.
first public Nov 4, 2026 · 1 source
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Deployments running Apache ZooKeeper up to and including 3.9.6 are affected. Default deployments leave the /zookeeper/quota subtree world-writable, so an unauthenticated client on the network can trigger the crash; deployments that restrict that subtree's ACLs or run a fixed version can skip it.
Not affected if fixed-version, restricted-acl
Who cares hadoop, kafka, kubernetes, self-hosted, zookeeper
zkServer.sh banner or the zookeeper-*.jar name in the lib directory, and compare it with the affected range./zookeeper/quota subtree is writable by clients that are not authenticated, for example with getAcl /zookeeper/quota in zkCli.sh.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.
3.8.83.9.7This page as .md · .json · in your agent: get_signal("CVE-2026-100300") · 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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