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CVE-2026-59969 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: CISA-ADPCVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
http://www.openwall.com/lists/oss-security/2026/09/15/4	CVE	Mailing ListThird Party Advisory
https://lists.apache.org/thread/qf9kwsgtgbgtvwls6f41281846xg0rss	[email protected]	Mailing ListVendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-297	Improper Validation of Certificate with Host Mismatch	[email protected]

Affected Products

Product	Versions
apache zookeeper	>= 3.8.0, < 3.8.7 >= 3.9.0, < 3.9.6
CPE cpe:2.3:a:apache:zookeeper:::::::: Remediation No remediation found in references.

Change History

4 change records found show changes

Date	Action	Recorded By
Sep 18, 2026	Initial Analysis	[email protected]
Sep 17, 2026	CVE Modified	CISA-ADP
Sep 16, 2026	CVE Modified	CVE
Sep 16, 2026	New CVE Received	[email protected]