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Improper Validation of Certificate with Host Mismatch Affecting zookeeper-3.9-advanced-compat package, versions <3.9.6-r0

Severity

 Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.36% (31st percentile)

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  • Snyk IDSNYK-MINIMOSLATEST-ZOOKEEPER39ADVANCEDCOMPAT-19958009
  • published20 Sept 2026
  • disclosed16 Sept 2026
Report a new vulnerability Found a mistake?

Introduced: 16 Sep 2026

NewCVE-2026-59969  (opens in a new tab)
CWE-297  (opens in a new tab)

How to fix?

Upgrade Minimos:latest zookeeper-3.9-advanced-compat to version 3.9.6-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream zookeeper-3.9-advanced-compat package and not the zookeeper-3.9-advanced-compat package as distributed by Minimos. See How to fix? for Minimos:latest relevant fixed versions and status.

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.