CVE-2026-24308
Published: 07 March 2026
Summary
CVE-2026-24308 is a high-severity Insertion of Sensitive Information into Log File (CWE-532) vulnerability in Apache Zookeeper. Its CVSS base score is 7.5 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 6.5th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 AU-9 (Protection of Audit Information) and SI-2 (Flaw Remediation).
Deeper analysis
CVE-2026-24308 involves improper handling of configuration values in ZKConfig within Apache ZooKeeper versions 3.8.5 and 3.9.4 across all platforms. This flaw, mapped to CWE-532 (Insertion of Sensitive Information into Log File), results in sensitive information from client configurations being logged at the INFO level in the client's logfile, potentially affecting production environments. The vulnerability carries a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N), indicating high confidentiality impact.
An unauthenticated attacker accessible over the network can exploit this issue with low attack complexity and no user interaction required. Exploitation enables the attacker to disclose sensitive client configuration data from the logfile, achieving high confidentiality impact without affecting integrity or availability.
Apache advisories recommend upgrading to ZooKeeper versions 3.8.6 or 3.9.5 to remediate the issue. Additional details are provided in the Apache mailing list thread at https://lists.apache.org/thread/qng3rtzv2pqkmko4rhv85jfplkyrgqdr and the oss-security announcement at http://www.openwall.com/lists/oss-security/2026/03/07/5.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-10140
Vulnerability details
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…
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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.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
CVE enables remote unauthenticated exploitation of a public-facing ZooKeeper service (T1190) resulting in disclosure of sensitive configuration data from local log files (T1005).
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Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Requires timely identification, reporting, and remediation of the specific flaw in ZooKeeper's ZKConfig by upgrading to patched versions 3.8.6 or 3.9.5.
Protects client logfiles containing exposed sensitive configuration values from unauthorized access, modification, or deletion.
Monitors for indicators of sensitive client configuration information disclosure through inappropriate logging or access to logfiles.