CVE-2026-59969
Apache ZooKeeper: Improper validation of certificate with host mismatch in FIPS mode
- State
- Published
- Severity
- 7.5 High
- Published
- Sep 16, 2026
- Updated
- Sep 17, 2026
- Reserved
- Jul 7, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N | CISA-ADP |
Weaknesses
- CWE-297 Improper Validation of Certificate with Host Mismatch
Affected Products
| Product | Versions |
|---|---|
Apache ZooKeeperApache Software Foundation |
|
References
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