{"id":"EM-20261104-K5WS","url":"https://cyber.eventmonitor.net/incident/EM-20261104-K5WS/zookeeper-vulnerability-cve-2026-100300/","type":"cve","title":"zookeeper Vulnerability (CVE-2026-100300)","subtitle":"CVE-2026-100300","subject":"CVE-2026-100300","status":"Developing","severity":"high","affected":[],"headline":null,"born":"2026-11-04T11:17:06.873Z","firstSignal":"2026-11-04T10:45:14.000Z","lastSignal":"2026-11-04T11:17:06.873Z","updated":"2026-11-06T00:58:29.349Z","revision":1,"life":[{"status":"Born","at":"2026-11-04T11:17:06.873Z","why":"second independent source: C6 NVD CVE API 2.0"},{"status":"Developing","at":"2026-11-04T11:17:06.873Z","why":"signals keep joining"}],"changeLog":[{"at":"2026-11-04T10:45:14.000Z","what":"First signal: C41 Red Hat Security Data"},{"at":"2026-11-04T11:17:06.873Z","what":"Born: second source, C6 NVD CVE API 2.0. Page EM-20261104-K5WS created."}],"stages":[{"name":"Disclosed","at":"2026-11-04T11:17:06.873Z","detail":"C6 NVD published"},{"name":"Scored","at":"2026-11-04T11:17:06.873Z","detail":"CVSS 8.7 · EPSS 0.5%"},{"name":"Exploited","at":null,"detail":"No exploitation reported"},{"name":"Advisories","at":null,"detail":"None yet"},{"name":"Vendor Response","at":"2026-11-04T10:45:14.000Z","detail":"C41 published"},{"name":"Resolved","at":null,"detail":"After 14 quiet days"}],"signals":[{"at":"2026-11-04T10:45:14.000Z","source":"C41","sourceName":"Red Hat Security Data","role":"Vendor","severity":3,"title":"Red Hat: CVE-2026-100300 (important)","text":"zookeeper: zookeeper: Denial of Service via improper exception handling in quota subsystem","url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-100300.json"},{"at":"2026-11-04T11:17:06.873Z","source":"C6","sourceName":"NVD CVE API 2.0","role":"Database","severity":3,"title":"CVE-2026-100300 (CVSS 8.7)","text":"Improper handling of exceptional conditions in the quota subsystem of Apache ZooKeeper allows an attacker able to write under the /zookeeper/quota subtree — unauthenticated on default deployments, where that subtree is world-writable — to crash the server's critical request-processing thread and render the on-disk data directory permanently unbootable.\n\nThis issue affects Apache ZooKeeper up to and including 3.9.6. Users are recommended to upgrade to version 3.8.8 or 3.9.7, which fixes the issue.","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-100300"}],"crowd":[],"reference":{"nvd":{"published":"2026-11-04T11:17:06.873","score":8.7,"severity":"HIGH","desc":"Improper handling of exceptional conditions in the quota subsystem of Apache ZooKeeper allows an attacker able to write under the /zookeeper/quota subtree — unauthenticated on default deployments, where that subtree is world-writable — to crash the server's critical request-processing thread and ren","product":"","seen":1793817148789},"kev":null,"epss":{"epss":0.00485,"pct":0.4194,"at":1793926709349},"p0":false},"mergedInto":null,"publisher":"Event Monitor Cyber"}