Advisory [CVE-2026-24308] Apache ZooKeeper: Sensitive information disclosure in client configuration handling
This security Apache Software Foundation advisory covers CVE-2026-24308 affecting Apache ZooKeeper.
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Summary
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.
- Apache ZooKeeper 3.9.0 through 3.9.4
- Apache ZooKeeper 3.8.0 through 3.8.5
Official advisory · medium-confidence parse· fetched 4 months ago·verify at source
- 3.8.6
- 3.9.5
Official advisory · medium-confidence parse· fetched 4 months ago·verify at source
Mitigation checklist
- Users are recommended to upgrade to version 3.8.6 or 3.9.5 which fixes this issue.
Official advisory · medium-confidence parse· fetched 4 months ago·verify at source
More Apache Software Foundation advisories
- CVE-2026-84501Sep 16, 2026unauthenticated attacker can inject arbitrary fake log lines into Apache ZooKeeper's
- CVE-2026-84439Sep 16, 2026When audit logging is enabled (zookeeper.audit.enable=true), an unauthenticated attacker
- CVE-2026-79993Sep 16, 2026Apache ZooKeeper: The `deleteContainer` opcode (0x14/20) is processed without verifying
- CVE-2026-59969Sep 16, 2026Apache ZooKeeper quorum TLS fails to enforce peer hostname verification in FIPS-mode
- CVE-2026-59739Sep 16, 2026Information disclosure via SetWatches reconnect replay in Apache ZooKeeper due to missing
- CVE-2026-24281Mar 7, 2026Apache ZooKeeper: Reverse-DNS fallback enables hostname verification bypass in ZooKeeper
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