CVE-2026-24308 Apache ZooKeeper: Sensitive information disclosure in client configuration handling
Attackers can expose sensitive client configuration data in ZooKeeper logs due to improper handling of configuration values.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-24308?
CVE-2026-24308 is a medium-severity vulnerability in Apache ZooKeeper, published on 7 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Improper handling of configuration values in ZKConfig in Apache ZooKeeper 3.8.5 and 3.9.4 on all platforms allows an attacker to expose sensitive information stored in client configuration in the client's logfile. Configuration values are exposed at INFO level logging rendering potential production systems affected by the issue. Users are recommended to upgrade to version 3.8.6 or 3.9.5 which fixes this issue.
Which versions are affected by CVE-2026-24308?
5 open source packages ship an affected version, including org.apache.zookeeper:zookeeper and zookeeper. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.apache.zookeeper:zookeeper Maven | From 3.8.0 | 3.8.6 |
org.apache.zookeeper:zookeeper Maven | From 3.8.0 | 3.8.6 |
org.apache.zookeeper:zookeeper Maven | From 3.9.0 | 3.9.5 |
org.apache.zookeeper:zookeeper Maven | From 3.9.0 | 3.9.5 |
zookeeper Bitnami | From 3.8.0 | 3.8.6, 3.9.5 |
Products include Apache Zookeeper.
How do I fix CVE-2026-24308?
Upgrade org.apache.zookeeper:zookeeper to a fixed version for your release line: 3.8.6 or 3.9.5.
Is CVE-2026-24308 being exploited?
There is no known exploitation of CVE-2026-24308 in the wild and no public exploit code.
Other vulnerabilities in Apache ZooKeeper
- CVE-2024-51504 Apache ZooKeeper: Authentication bypass with IP-based authentication in Admin Server
- CVE-2023-44981 Apache ZooKeeper: Authorization bypass in SASL Quorum Peer Authentication
- CVE-2016-5017 Memory corruption in n/a
- CVE-2026-59739 Apache ZooKeeper: Information disclosure via SetWatches reconnect replay
- CVE-2026-59969 Apache ZooKeeper: Improper validation of certificate with host mismatch in FIPS mode
Sources
Also known as BIT-zookeeper-2026-24308, CLEANSTART-2026-JW75132, CLEANSTART-2026-LF42316, DEBIAN-CVE-2026-24308, ECHO-3f43-4964-01f0, GHSA-crhr-qqj8-rpxc and 19 more.