{"id":"CVE-2026-100300","aliases":["DEBIAN-CVE-2026-100300","EUVD-2026-116868","GHSA-7xqw-mw2f-8c7x","UBUNTU-CVE-2026-100300"],"status":"published","title":"Apache ZooKeeper: Unauthenticated persistent denial of service via unvalidated quota-node data and paths crashing the transaction-apply thread","description":"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.","severity":{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00485,"percentile":0.42119,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-755"],"published":"2026-11-04T10:45:14Z","modified":"2026-11-06T15:01:04Z","affected":[{"source":"osv","ecosystem":"Debian:12","package":"zookeeper","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.8.0-11","3.8.0-11+deb12u1","3.8.0-11+deb12u2","3.9.1-1","3.9.2-1","3.9.2-2","3.9.3-1","3.9.3-2","3.9.4-1","3.9.4-2","3.9.5-1","3.9.5-2","3.9.6-1","3.9.6-2","3.9.6-3"]},{"source":"osv","ecosystem":"Debian:13","package":"zookeeper","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.9.3-1","3.9.3-1+deb13u1","3.9.3-2","3.9.4-1","3.9.4-2","3.9.5-1","3.9.5-2","3.9.6-1","3.9.6-2","3.9.6-3"]},{"source":"osv","ecosystem":"Debian:14","package":"zookeeper","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.9.3-1","3.9.3-2","3.9.4-1","3.9.4-2","3.9.5-1","3.9.5-2","3.9.6-1","3.9.6-2","3.9.6-3"]},{"source":"osv","ecosystem":"Ubuntu:Pro:14.04:LTS","package":"zookeeper","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.4.5+dfsg-1","3.4.5+dfsg-1ubuntu0.1~esm1","3.4.5+dfsg-1ubuntu0.1~esm3"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"zookeeper","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.4.6-8","3.4.7-1","3.4.8-1","3.4.8-1ubuntu0.1~esm1","3.4.8-1ubuntu0.1~esm2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"zookeeper","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.4.10-2","3.4.10-3","3.4.13-3","3.4.13-3ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"zookeeper","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.4.13-1","3.4.13-3","3.4.13-3build1","3.4.13-4","3.4.13-5","3.4.13-5build1","3.4.13-5ubuntu0.1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"zookeeper","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.4.13-5ubuntu4","3.4.13-6ubuntu2","3.4.13-6ubuntu3","3.4.13-6ubuntu4","3.4.13-6ubuntu4.1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"zookeeper","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.8.0-11","3.9.1-1","3.9.1-1build1","3.9.1-1build2"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"zookeeper","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.9.5-1","3.9.5-2"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"zookeeper","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.9.3-1build2","3.9.3-1build3","3.9.4-1","3.9.5-1"]}],"products":[{"vendor":"apache software foundation","product":"apache zookeeper"}],"references":[{"url":"https://lists.apache.org/thread.html/09pgg7rcpzz44noxgtvpzstwt8fmvsb0","tags":["vendor-advisory","report"]},{"url":"http://www.openwall.com/lists/oss-security/2026/11/03/11","tags":["report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-100300"},{"url":"https://github.com/advisories/GHSA-7xqw-mw2f-8c7x"},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-100300","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-100300","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-100300","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-100300","title":"Apache ZooKeeper: Unauthenticated persistent denial of service via unvalidated quota-node data and paths crashing the transaction-apply thread","description":"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.","status":"published","published":"2026-11-04T10:45:14.858Z","modified":"2026-11-04T15:18:55.306Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna"}],"cwes":["CWE-755"],"updated_at":"2026-11-04T16:33:47.459854Z"}],"euvd":[{"id":"EUVD-2026-116868","description":"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.","status":"published","published":"2026-11-04T10:45:14Z","modified":"2026-11-04T15:18:55Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-04T16:10:35.925015Z"}],"ghsa":[{"id":"GHSA-7xqw-mw2f-8c7x","title":"Improper handling of exceptional conditions in the quota subsystem of Apache ZooKeeper allows an...","description":"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.","status":"published","published":"2026-11-04T12:31:30Z","modified":"2026-11-04T12:31:31Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"}],"cwes":["CWE-755"],"updated_at":"2026-11-04T12:34:56.311878Z"}],"nvd":[{"id":"CVE-2026-100300","description":"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.","status":"published","published":"2026-11-04T11:17:06.873Z","modified":"2026-11-04T16:17:30.95Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"}],"cwes":["CWE-755"],"updated_at":"2026-11-04T18:06:26.923818Z"}],"osv":[{"id":"DEBIAN-CVE-2026-100300","description":"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.  This 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.","status":"published","published":"2026-11-04T11:17:06.873Z","modified":"2026-11-06T15:01:04.712890509Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"}],"updated_at":"2026-11-06T15:27:36.398977Z"},{"id":"UBUNTU-CVE-2026-100300","description":"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. This 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.","status":"published","published":"2026-11-05T00:00:00Z","modified":"2026-11-06T01:00:17.493054365Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-06T01:33:11.614208Z"}]}}