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.

Score

CVSS 3.1 7.5 High

Status

Analyzed - security@apache.org

Published

2026-09-16

Last modified

2026-09-17

Weaknesses

CWE-297

Affected products

• Zookeeper (Apache)
• Apache Zookeeper (Apache Software Foundation)

References

• https://lists.apache.org/thread/qf9kwsgtgbgtvwls6f41281846xg0rss
• http://www.openwall.com/lists/oss-security/2026/09/15/4