CVE-2026-59739

{"id": "CVE-2026-59739", "cveTags": [], "metrics": {}, "affected": [{"source": "security@apache.org", "affectedData": [{"vendor": "Apache Software Foundation", "product": "Apache ZooKeeper", "versions": [{"status": "affected", "version": "3.9.0", "versionType": "maven", "lessThanOrEqual": "3.9.5"}, {"status": "affected", "version": "3.8.0", "versionType": "semver", "lessThanOrEqual": "3.8.6"}], "packageURL": "pkg:maven/org.apache.zookeeper/zookeeper", "packageName": "org.apache.zookeeper:zookeeper", "collectionURL": "https://repo.maven.apache.org/maven2", "defaultStatus": "unaffected"}]}], "published": "2026-09-16T10:16:51.097", "references": [{"url": "https://lists.apache.org/thread/v0lrwsbdxvx6w67p3z7fxf3hzyncq55l", "source": "security@apache.org"}], "vulnStatus": "Received", "weaknesses": [{"type": "Primary", "source": "security@apache.org", "description": [{"lang": "en", "value": "CWE-862"}]}], "descriptions": [{"lang": "en", "value": "Information disclosure via SetWatches reconnect replay in Apache ZooKeeper due to missing ACL check.\u00a0An 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\u00a0CVE-2024-23944 (ZOOKEEPER-4799).\u00a0The fix added ACL checking to WatchManager.triggerWatch(). However, DataTree.setWatches() \u2014 the SetWatches/SetWatches2 reconnect replay handler \u2014 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."}], "lastModified": "2026-09-16T10:16:51.097", "sourceIdentifier": "security@apache.org"}