{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-59969", "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "state": "PUBLISHED", "assignerShortName": "apache", "dateReserved": "2026-07-07T18:50:40.959Z", "datePublished": "2026-09-16T09:27:00.726Z", "dateUpdated": "2026-09-16T10:11:44.041Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "shortName": "apache", "dateUpdated": "2026-09-16T09:27:00.726Z"}, "title": "Apache ZooKeeper: Improper validation of certificate with host mismatch in FIPS mode", "problemTypes": [{"descriptions": [{"description": "CWE-297 Improper Validation of Certificate with Host Mismatch", "lang": "en", "cweId": "CWE-297", "type": "CWE"}]}], "source": {"discovery": "UNKNOWN"}, "affected": [{"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"}], "descriptions": [{"value": "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\u00a0are enabled, the Java SSLSocket\u00a0quorum 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.\n\n\n\nUsers are recommended to upgrade to version 3.8.7 or 3.9.6, which fixes the issue.", "lang": "en", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>Apache ZooKeeper quorum TLS fails to enforce peer hostname verification in FIPS-mode deployments. When <code>sslQuorum=true</code>, <code>zookeeper.fips-mode=true</code>, <code>ssl.quorum.hostnameVerification=true</code>, and <code>ssl.quorum.clientHostnameVerification=true</code>&nbsp;are enabled, the Java <code>SSLSocket</code>&nbsp;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.</p><p>Users are recommended to upgrade to version 3.8.7 or 3.9.6, which fixes the issue.</p>"}]}], "references": [{"url": "https://lists.apache.org/thread/qf9kwsgtgbgtvwls6f41281846xg0rss", "tags": ["vendor-advisory"]}], "metrics": [{"other": {"type": "Textual description of severity", "content": {"text": "important"}}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "credits": [{"lang": "en", "value": "Erichen <chenyoulong20g@ict.ac.cn>", "type": "reporter"}], "x_generator": {"engine": "Vulnogram 0.2.0"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "http://www.openwall.com/lists/oss-security/2026/09/15/4"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-09-16T10:11:44.041Z"}}]}}

{}

{"affected": [{"affectedData": [{"collectionURL": "https://repo.maven.apache.org/maven2", "defaultStatus": "unaffected", "packageName": "org.apache.zookeeper:zookeeper", "packageURL": "pkg:maven/org.apache.zookeeper/zookeeper", "product": "Apache ZooKeeper", "vendor": "Apache Software Foundation", "versions": [{"lessThanOrEqual": "3.9.5", "status": "affected", "version": "3.9.0", "versionType": "maven"}, {"lessThanOrEqual": "3.8.6", "status": "affected", "version": "3.8.0", "versionType": "maven"}]}], "source": "security@apache.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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\u00a0are enabled, the Java SSLSocket\u00a0quorum 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.\n\n\n\nUsers are recommended to upgrade to version 3.8.7 or 3.9.6, which fixes the issue."}], "id": "CVE-2026-59969", "lastModified": "2026-09-16T19:08:00.110", "metrics": {}, "published": "2026-09-16T10:16:51.220", "references": [{"source": "security@apache.org", "url": "https://lists.apache.org/thread/qf9kwsgtgbgtvwls6f41281846xg0rss"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2026/09/15/4"}], "sourceIdentifier": "security@apache.org", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-297"}], "source": "security@apache.org", "type": "Secondary"}]}

{}

{"created": "2026-09-16T14:00:11.966093+00:00", "updated": "2026-09-16T14:00:11.966100+00:00", "vendors": []}