Apache ZooKeeper: Insertion of Sensitive Information into Log File
CVE-2026-24308 is a high-severity insertion of sensitive information into log file vulnerability in Apache ZooKeeper from Apache, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected Apache ZooKeeper versions: 3.9.0 through 3.9.4; 3.8.0 through 3.8.5. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 1.29% chance of exploitation within 30 days, higher than 71% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Zookeeper to 3.8.6 or 3.9.5, whichever matches your release line, or a later version.
- Read the advisory on lists.apache.org for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Apache | Apache ZooKeeper | 3.9.0 through 3.9.4; 3.8.0 through 3.8.5 | Not stated |
| Red Hat | Red Hat AMQ Broker 7.12.7 | Not specified in the record | Not stated |
| Red Hat | Red Hat AMQ Broker 7.13.5 | Not specified in the record | Not stated |
| Red Hat | Red Hat AMQ Broker 7.14.0 | Not specified in the record | Not stated |
| Red Hat | Streams for Apache Kafka 2.9.4 | Not specified in the record | Not stated |
| Red Hat | Red Hat OpenShift AI 2.25 | Not specified in the record | Not stated |
| Red Hat | Red Hat build of Apache Camel for Spring Boot 4 | Not specified in the record | Not stated |
| Red Hat | Red Hat build of Debezium 2 | Not specified in the record | Not stated |
| Red Hat | Red Hat build of Debezium 3 | Not specified in the record | Not stated |
| Red Hat | Red Hat Data Grid 8 | Not specified in the record | Not stated |
| Red Hat | Red Hat Fuse 7 | Not specified in the record | Not stated |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7 | Not specified in the record | Not stated |
| Red Hat | Red Hat JBoss Enterprise Application Platform 8 | Not specified in the record | Not stated |
| Red Hat | Red Hat JBoss Enterprise Application Platform Expansion Pack | Not specified in the record | Not stated |
| Red Hat | Red Hat Offline Knowledge Portal | Not specified in the record | Not stated |
| Red Hat | Red Hat OpenShift AI (RHOAI) | Not specified in the record | Not stated |
| Red Hat | streams for Apache Kafka 3 | Not specified in the record | Not stated |
| Apache | Zookeeper | 3.8.0 up to, but not including, 3.8.6; 3.9.0 up to, but not including, 3.9.5 | 3.8.6, 3.9.5 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- NoneNothing can be modified.
- Availability
- NoneAvailability is not affected.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.5 | High | NVD |
| CVSS 3.1 | 6.5 | Medium | CISA (ADP) |
| CVSS 3.1 | 3.3 | Low | CNA |
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.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Insertion of Sensitive Information into Log File
The product writes sensitive information to a log file.
How developers prevent this class of flaw
- Consider seriously the sensitivity of the information written into log files. Do not write secrets into the log files.
- Remove debug log files before deploying the application into production.
- Protect log files against unauthorized read/write.
More Insertion of Sensitive Information into Log File vulnerabilities (CWE-532)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Advisories
Third-party and government advisories
- openwall.com/lists/oss-security/2026/03/07/5Mailing List, Third Party Advisory
Other references
- access.redhat.com/errata/RHSA-2026:10184
- access.redhat.com/errata/RHSA-2026:14272
- access.redhat.com/errata/RHSA-2026:14276
- access.redhat.com/errata/RHSA-2026:34608
- access.redhat.com/errata/RHSA-2026:8509
- access.redhat.com/security/cve/CVE-2026-24308
- bugzilla.redhat.com/show_bug.cgi?id=2445451
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-24308.json
Other vulnerabilities in Apache ZooKeeper
- 8.7 High severity
- 7.1 High severity
- 8.7 High severity
- 8.6 High severity
- 7.5 High severity
- 7.5 High severity
Recent Insertion of Sensitive Information into Log File vulnerabilities
- 7.7 High severity
- 7.5 High severity
- 7.5 High severity
- 8.1 High severity
- 7.5 High severity
- 9.8 Critical severity
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