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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache Software Foundation | Apache ZooKeeper | 3.9.0 – ≤ 3.9.6, 3.8.0 – ≤ 3.8.7 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | zookeeper | 3.9.7-1 | — |
| Debian 13 | zookeeper | No fix yet | — |
| Debian 12 | zookeeper | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | zookeeper | No fix yet | — |
| Ubuntu 26.04 LTS | zookeeper | No fix yet | — |
| Ubuntu 24.04 LTS | zookeeper | No fix yet | — |
| Ubuntu 22.04 LTS | zookeeper | No fix yet | — |
| Ubuntu 20.04 LTS | zookeeper | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | zookeeper | No fix yet | — |
| Ubuntu Pro 16.04 LTS | zookeeper | No fix yet | — |
| Ubuntu Pro 14.04 LTS | zookeeper | No fix yet | — |