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CVE PROGRAM SOURCE RECORD7.5 High

CVE-2026-59969

Apache ZooKeeper: Improper validation of certificate with host mismatch in FIPS mode

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Status
Published
Published
Updated
Assigning organization
apache

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Apache Software Foundation Apache ZooKeeper

Default version status: unaffected

  • 3.9.0 to ≤ 3.9.5affected
  • 3.8.0 to ≤ 3.8.6affected
pkg:maven/org.apache.zookeeper/zookeeper

References