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Back to active CVEs
High · CVSS 7.5CVE-2026-59739

Apache ZooKeeper: Information disclosure via SetWatches reconnect replayCVE-2026-59739

Answer in brief

CVE-2026-59739 records a High severity (CVSS 7.5) vulnerability in Apache ZooKeeper: Information disclosure via SetWatches reconnect replay. The current sources do not mark it as known exploited. The current feed maps Apache Software Foundation/Apache ZooKeeper (generic), Apache Software Foundation/Apache ZooKeeper (generic), Apache Software Foundation/org.apache.zookeeper:zookeeper (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 16, 2026Updated Sep 18, 2026Source checked Oct 31, 2026First seen by HOL Sep 16, 2026Material review Sep 18, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.5
Exploitation
Not marked as known exploited
Affected software
4 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Apache Software Foundation/Apache ZooKeeper (generic), Apache Software Foundation/Apache ZooKeeper (generic), Apache Software Foundation/org.apache.zookeeper:zookeeper (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:a:apache:zookeeper:*:*:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Apache Software Foundation/Apache ZooKeepergeneric3.9.0 || 3.8.0Not reported
Apache Software Foundation/Apache ZooKeepergeneric>=3.9.0 <=3.9.5 || >=3.8.0 <=3.8.6Not reported
Apache Software Foundation/org.apache.zookeeper:zookeepergeneric>=3.9.0 <=3.9.5 || >=3.8.0 <=3.8.6Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Apache Software Foundation/Apache ZooKeeper, Apache Software Foundation/Apache ZooKeeper, Apache Software Foundation/org.apache.zookeeper:zookeeper.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Sep 16, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 18, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 16, 2026

Sources and claim methodology

  • Source referencelists.apache.org
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Perfect Images <= 7.2.0 - Missing Authorization to Authenticated (Author+) Image ReplacementAlso CWE-862
  • Redux Framework <= 4.5.15 - Missing Authorization to Authenticated (Subscriber+) Sensitive Information Disclosure via /wp-admin/profile.php inline redux_<opt_name> JavaScriptAlso CWE-862
  • Hustle <= 7.8.14.3 - Missing Authorization to Authenticated (Custom+) ESP Credential Overwrite and Irreversible OAuth Token Deletion via 'hustle_provider_migrate_hubspot' (and sibling migrate_*) AJAX ActionAlso CWE-862
  • WP Data Access <= 5.5.88 - Missing Authorization to Unauthenticated Sensitive Information Exposure via 'rel_tab' ParameterAlso CWE-862
  • Product Filter for WooCommerce by WBW <= 3.4.6 - Missing Authorization to Unauthenticated Information Disclosure via filterSettings[default_query] ParameterAlso CWE-862
  • WP Booking System <= 2.1.0.5 - Missing Authorization to Unauthenticated Arbitrary Calendar Note Deletion via wpbs_calendar_remove_note AJAX ActionAlso CWE-862

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-862
Source
CVE List V5
Source checked
Oct 31, 2026
References
1 linked source
Open source record