CVE-2026-59969
Apache ZooKeeper: Improper validation of certificate with host mismatch in FIPS mode
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
Apache ZooKeeper quorum TLS fails to enforce peer hostname verification in FIPS-mode deployments. When sslQuorum=true, zookeeper.fips-mode=true, ssl.quorum.hostnameVerification=true, and ssl.quorum.clientHostnameVerification=true are enabled, the Java SSLSocket quorum path accepts a CA-trusted peer certificate whose SAN does not match the connected host. A malicious or misissued peer certificate can therefore join quorum traffic, participate in leader election, and enter replication flows. Users are recommended to upgrade to version 3.8.7 or 3.9.6, which fixes the issue.
| CWE | CWE-297 |
| Vendor | apache software foundation |
| Product | apache zookeeper |
| Published | Sep 16, 2026 |
| Last Updated | Sep 16, 2026 |
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Affected Versions
Apache Software Foundation / Apache ZooKeeper
3.9.0 ≤ 3.9.5 3.8.0 ≤ 3.8.6
References
Credits
🔍 Erichen <[email protected]>