CVE-2026-59969

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-297

• https://lists.apache.org/thread/qf9kwsgtgbgtvwls6f41281846xg0rssMailing List, Vendor Advisory
• https://www.openwall.com/lists/oss-security/2026/09/15/4Mailing List, Third Party Advisory

Published

Sep 16, 2026

Last Modified

Sep 18, 2026

Status

Analyzed

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