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CVE-2026-59969

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

cve-program · severity unknownCVSS unknownCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-59969

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-59969

Published

org.apache.zookeeper:zookeeper

https://repo.maven.apache.org/maven2

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Apache Software Foundation",
                    "product": "Apache ZooKeeper",
                    "collectionURL": "https://repo.maven.apache.org/maven2",
                    "packageName": "org.apache.zookeeper:zookeeper",
                    "packageURL": "pkg:maven/org.apache.zookeeper/zookeeper",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "3.9.0",
                            "lessThanOrEqual": "3.9.5",
                            "versionType": "maven"
                        },
                        {
                            "status": "affected",
                            "version": "3.8.0",
                            "lessThanOrEqual": "3.8.6",
                            "versionType": "maven"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }

Original source record · Cite this exact observation · Complete original publisher JSON