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GHSA-WRGG-C9RW-J78F

Vulnerability from github – Published: 2026-09-16 12:30 – Updated: 2026-09-17 21:31

Details

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.

Severity

7.5 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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{
  "affected": [],
  "aliases": [
    "CVE-2026-59739"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-862"
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    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-16T10:16:51Z",
    "severity": "HIGH"
  },
  "details": "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\u0027s 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.",
  "id": "GHSA-wrgg-c9rw-j78f",
  "modified": "2026-09-17T21:31:33Z",
  "published": "2026-09-16T12:30:30Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-59739"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread/v0lrwsbdxvx6w67p3z7fxf3hzyncq55l"
    }
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  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-59739 (GCVE-0-2026-59739)

Vulnerability from cvelistv5 – Published: 2026-09-16 09:26 – Updated: 2026-09-17 19:19

Title

Apache ZooKeeper: Information disclosure via SetWatches reconnect replay

Summary

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-17 19:17 UTC

CWE

CWE-862 - Missing Authorization

Assigner

apache mitre root

References

1 reference

URL	Tags
https://lists.apache.org/thread/v0lrwsbdxvx6w67p3…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
Apache Software Foundation	Apache ZooKeeper	Affected: 3.9.0 , ≤ 3.9.5 (maven) Affected: 3.8.0 , ≤ 3.8.6 (semver)

Credits

NGUYEN HONG QUAN <hongquanvp11@gmail.com> n0mi1k <nomilksec@gmail.com>

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JSON

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              "confidentialityImpact": "HIGH",
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.