CVE-2026-59969

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.

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Produits concernés

• Apache Software Foundation Apache ZooKeeper
• Apache zookeeper

Scores CVSS

Faiblesses (CWE)

• CWE-297

Références

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

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories