Vulnerability-Lookup

GHSA-4PPQ-6VHC-4Q97

Vulnerability from github – Published: 2026-11-04 12:31 – Updated: 2026-11-04 15:32

Details

Uncontrolled recursion in Apache ZooKeeper. The server serializes its data tree to a snapshot by recursing one stack frame per znode level, with no depth bound. A client permitted to create znodes (the default root ACL is open) can build a chain of nested znodes deep enough that taking a snapshot exhausts the JVM stack and kills the snapshot thread; sizes stay within jute.maxbuffer, so existing limits do not prevent it. This is a denial of service that becomes persistent: on restart the server rebuilds the deep tree from its transaction log and fails again while taking the startup snapshot, so it does not return to service, and recovery can entail data loss. The same log affects a leader and its followers, so it can spread across an ensemble.

This issue affects Apache ZooKeeper 3.8.0 through 3.8.7 and 3.9.0 through 3.9.6. Users are recommended to upgrade to 3.8.8 or 3.9.7, which fix the issue. As a workaround, use ACLs and authentication to restrict znode creation rather than relying on the default open root ACL.

Severity

8.7 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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{
  "affected": [],
  "aliases": [
    "CVE-2026-115448"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-770"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-11-04T11:17:14Z",
    "severity": "HIGH"
  },
  "details": "Uncontrolled recursion in Apache ZooKeeper. The server serializes its data tree to a snapshot by recursing one stack frame per znode level, with no depth bound. A client permitted to create znodes (the default root ACL is open) can build a chain of nested znodes deep enough that taking a snapshot exhausts the JVM stack and kills the snapshot thread; sizes stay within jute.maxbuffer, so existing limits do not prevent it. This is a denial of service that becomes persistent: on restart the server rebuilds the deep tree from its transaction log and fails again while taking the startup snapshot, so it does not return to service, and recovery can entail data loss. The same log affects a leader and its followers, so it can spread across an ensemble.\n\nThis issue affects Apache ZooKeeper 3.8.0 through 3.8.7 and 3.9.0 through 3.9.6. Users are recommended to upgrade to 3.8.8 or 3.9.7, which fix the issue. As a workaround, use ACLs and authentication to restrict znode creation rather than relying on the default open root ACL.",
  "id": "GHSA-4ppq-6vhc-4q97",
  "modified": "2026-11-04T15:32:29Z",
  "published": "2026-11-04T12:31:30Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-115448"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/p892jm8qw0zqv8z152lpokyt7mp6gc41"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/11/03/13"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-115448 (GCVE-0-2026-115448)

Vulnerability from cvelistv5 – Published: 2026-11-04 10:45 – Updated: 2026-11-04 15:18

Title

Apache ZooKeeper: Unbounded recursion in snapshot serialization allows a client to render the server unrecoverable

Summary

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-11-04 14:35 UTC

CWE

CWE-770 - Allocation of resources without limits or throttling

Assigner

apache CNA under the mitre root

CNA scorecard B 76/100 over 1112 records in the last 180 days details

References

2 references

URL	Tags
https://lists.apache.org/thread.html/p892jm8qw0zq…	vendor-advisory
http://www.openwall.com/lists/oss-security/2026/1…

Impacted products

1 product

Vendor	Product	Version
Apache Software Foundation	Apache ZooKeeper	Affected: 3.9.0 , ≤ 3.9.7 (maven) Affected: 3.8.0 , ≤ 3.8.8 (maven)

Credits

Sai Sreewathsa Kovalluri, Shon Babu, and Kannan K of Innspark Solutions (https://innspark.in/) Prasath Jayasundar & PayPal Cyber Security Team

Show details on NVD website

JSON

To clipboard

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        "references": [
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            "url": "http://www.openwall.com/lists/oss-security/2026/11/03/13"
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        "metrics": [
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                  },
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                  }
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                "role": "CISA Coordinator",
                "timestamp": "2026-11-04T14:35:34.807616Z",
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        "providerMetadata": {
          "dateUpdated": "2026-11-04T15:18:55.166Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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    "cna": {
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          "collectionURL": "https://repo.maven.apache.org/maven2",
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          "packageName": "org.apache.zookeeper:zookeeper",
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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.

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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.
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