Apache ZooKeeper: Information disclosure via SetWatches reconnect replay
Summary
| CVE | CVE-2026-59739 |
|---|---|
| State | PUBLISHED |
| Assigner | apache |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-09-16 10:16:51 UTC |
| Updated | 2026-09-16 10:16:51 UTC |
| 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. Users are recommended to upgrade to version 3.9.6, 3.8.7 which fixes the issue. |
Risk And Classification
Problem Types: CWE-862 | CWE-862 CWE-862 Missing Authorization
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Apache Software Foundation | Apache ZooKeeper | affected 3.9.0 3.9.5 maven | Not specified |
| CNA | Apache Software Foundation | Apache ZooKeeper | affected 3.8.0 3.8.6 semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| lists.apache.org/thread/v0lrwsbdxvx6w67p3z7fxf3hzyncq55l | [email protected] | lists.apache.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
There are currently no legacy QID mappings associated with this CVE.