{"api_version":"1","generated_at":"2026-09-16T11:20:22+00:00","cve":"CVE-2026-59739","urls":{"html":"https://cve.report/CVE-2026-59739","api":"https://cve.report/api/cve/CVE-2026-59739.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-59739","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-59739"},"summary":{"title":"Apache ZooKeeper: Information disclosure via SetWatches reconnect replay","description":"Information disclosure via SetWatches reconnect replay in Apache ZooKeeper due to missing ACL check. An attacker can discover ACL-restricted paths by registering exists-watches on non-existent paths, then reconnecting after the paths are created with restricted ACLs. Issue is caused by incomplete fix for CVE-2024-23944 (ZOOKEEPER-4799). The fix added ACL checking to WatchManager.triggerWatch(). However, DataTree.setWatches() — the SetWatches/SetWatches2 reconnect replay handler — still calls watcher.process(event) with null ACL, bypassing the check entirely. It's important to note that only the path is exposed by this vulnerability, not the data of znode, but since znode path can contain sensitive information like user name or login ID, this issue is potentially critical.\n\nUsers are recommended to upgrade to version 3.9.6, 3.8.7 which fixes the issue.","state":"PUBLISHED","assigner":"apache","published_at":"2026-09-16 10:16:51","updated_at":"2026-09-16 10:16:51"},"problem_types":["CWE-862","CWE-862 CWE-862 Missing Authorization"],"metrics":[],"references":[{"url":"https://lists.apache.org/thread/v0lrwsbdxvx6w67p3z7fxf3hzyncq55l","name":"https://lists.apache.org/thread/v0lrwsbdxvx6w67p3z7fxf3hzyncq55l","refsource":"security@apache.org","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-59739","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-59739","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Apache Software Foundation","product":"Apache ZooKeeper","version":"affected 3.9.0 3.9.5 maven","platforms":[]},{"source":"CNA","vendor":"Apache Software Foundation","product":"Apache ZooKeeper","version":"affected 3.8.0 3.8.6 semver","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[{"source":"CNA","value":"NGUYEN HONG QUAN <hongquanvp11@gmail.com>","lang":"en"},{"source":"CNA","value":"n0mi1k <nomilksec@gmail.com>","lang":"en"}],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"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":"semver"}]}],"credits":[{"lang":"en","type":"reporter","value":"NGUYEN HONG QUAN <hongquanvp11@gmail.com>"},{"lang":"en","type":"reporter","value":"n0mi1k <nomilksec@gmail.com>"}],"descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"Information disclosure via SetWatches reconnect replay in Apache ZooKeeper due to missing ACL check.&nbsp;An attacker can discover ACL-restricted paths by registering exists-watches on non-existent paths, then reconnecting after the paths are created with restricted ACLs. Issue is caused by incomplete fix for&nbsp;CVE-2024-23944 (ZOOKEEPER-4799).&nbsp;The fix added ACL checking to WatchManager.triggerWatch(). However, DataTree.setWatches() — the SetWatches/SetWatches2 reconnect replay handler — still calls watcher.process(event) with null ACL, bypassing the check entirely. It's important to note that only the path is exposed by this vulnerability, not the data of znode, but since znode path can contain sensitive information like user name or login ID, this issue is potentially critical.<br><br>Users are recommended to upgrade to version 3.9.6, 3.8.7 which fixes the issue."}],"value":"Information disclosure via SetWatches reconnect replay in Apache ZooKeeper due to missing ACL check. An attacker can discover ACL-restricted paths by registering exists-watches on non-existent paths, then reconnecting after the paths are created with restricted ACLs. Issue is caused by incomplete fix for CVE-2024-23944 (ZOOKEEPER-4799). The fix added ACL checking to WatchManager.triggerWatch(). However, DataTree.setWatches() — the SetWatches/SetWatches2 reconnect replay handler — still calls watcher.process(event) with null ACL, bypassing the check entirely. It's important to note that only the path is exposed by this vulnerability, not the data of znode, but since znode path can contain sensitive information like user name or login ID, this issue is potentially critical.\n\nUsers are recommended to upgrade to version 3.9.6, 3.8.7 which fixes the issue."}],"metrics":[{"other":{"content":{"text":"critical"},"type":"Textual description of severity"},"scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-862","description":"CWE-862 Missing Authorization","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-09-16T09:26:37.690Z","orgId":"f0158376-9dc2-43b6-827c-5f631a4d8d09","shortName":"apache"},"references":[{"tags":["vendor-advisory"],"url":"https://lists.apache.org/thread/v0lrwsbdxvx6w67p3z7fxf3hzyncq55l"}],"source":{"discovery":"UNKNOWN"},"title":"Apache ZooKeeper: Information disclosure via SetWatches reconnect replay","x_generator":{"engine":"Vulnogram 0.2.0"}}},"cveMetadata":{"assignerOrgId":"f0158376-9dc2-43b6-827c-5f631a4d8d09","assignerShortName":"apache","cveId":"CVE-2026-59739","datePublished":"2026-09-16T09:26:37.690Z","dateReserved":"2026-07-06T20:46:19.936Z","dateUpdated":"2026-09-16T09:26:37.690Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-16 10:16:51","lastModifiedDate":"2026-09-16 10:16:51","problem_types":["CWE-862","CWE-862 CWE-862 Missing Authorization"],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"59739","Ordinal":"1","Title":"Apache ZooKeeper: Information disclosure via SetWatches reconnec","CVE":"CVE-2026-59739","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"59739","Ordinal":"1","NoteData":"Information disclosure via SetWatches reconnect replay in Apache ZooKeeper due to missing ACL check. An attacker can discover ACL-restricted paths by registering exists-watches on non-existent paths, then reconnecting after the paths are created with restricted ACLs. Issue is caused by incomplete fix for CVE-2024-23944 (ZOOKEEPER-4799). The fix added ACL checking to WatchManager.triggerWatch(). However, DataTree.setWatches() — the SetWatches/SetWatches2 reconnect replay handler — still calls watcher.process(event) with null ACL, bypassing the check entirely. It's important to note that only the path is exposed by this vulnerability, not the data of znode, but since znode path can contain sensitive information like user name or login ID, this issue is potentially critical.\n\nUsers are recommended to upgrade to version 3.9.6, 3.8.7 which fixes the issue.","Type":"Description","Title":"Apache ZooKeeper: Information disclosure via SetWatches reconnec"}]}}}