{"cve":{"cve_id":"CVE-2026-59969","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.0033,"epss_percentile":0.24433,"epss_as_of":"2026-10-15","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.\n\n\n\nUsers are recommended to upgrade to version 3.8.7 or 3.9.6, which fixes the issue.","published_at":"2026-09-16T09:27:00.726000Z","last_modified_at":"2026-09-18T14:31:23.357000Z","cvss_v3_score":7.5,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","cvss_v3_severity":"HIGH","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-297"],"nvd_references":["https://lists.apache.org/thread/qf9kwsgtgbgtvwls6f41281846xg0rss"],"vuln_status":"Analyzed","trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-09-16T11:03:42.089224Z","updated_at":"2026-09-20T12:41:36.173174Z"},"effective_severity":"HIGH","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"N","value_label":"None"},{"metric":"I","name":"Integrity","value":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"N","value_label":"None"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"apache","vendor_name":"apache","product_slug":"zookeeper","product_name":"zookeeper","version_start":"3.8.0","version_start_inclusive":true,"version_end":"3.8.7","version_end_inclusive":false,"cpe23_uri":"cpe:2.3:a:apache:zookeeper:*:*:*:*:*:*:*:*"},{"vendor_slug":"apache-software-foundation","vendor_name":"Apache Software Foundation","product_slug":"apache-zookeeper","product_name":"Apache ZooKeeper","version_start":"3.9.0","version_start_inclusive":true,"version_end":"3.9.5","version_end_inclusive":true,"cpe23_uri":"cve5:apache-software-foundation:apache-zookeeper:3.9.0:3.9.5"},{"vendor_slug":"apache-software-foundation","vendor_name":"Apache Software Foundation","product_slug":"apache-zookeeper","product_name":"Apache ZooKeeper","version_start":"3.8.0","version_start_inclusive":true,"version_end":"3.8.6","version_end_inclusive":true,"cpe23_uri":"cve5:apache-software-foundation:apache-zookeeper:3.8.0:3.8.6"}],"exploit_refs":[],"news":[],"references":[{"url":"https://lists.apache.org/thread/qf9kwsgtgbgtvwls6f41281846xg0rss","source_type":"MAILING_LIST","tags":["mailing-list"]}],"timeline":[{"type":"published","at":"2026-09-16T09:27:00.726000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-09-17T21:03:42.089829Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-09-17T21:03:42.089829Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-09-17T21:03:42.089829Z","label":"CVSS score revised","source":"cvelistv5"}]}