Vulnerability-Lookup

CVE-2026-72685 (GCVE-0-2026-72685)

Vulnerability from cvelistv5 – Published: 2026-08-13 19:10 – Updated: 2026-08-13 20:34

Title

Inefficient Algorithmic Complexity in Elasticsearch Leading to Denial of Service

Summary

A flaw in Elasticsearch allows a low-privileged authenticated user who can index documents to submit a single small document containing a crafted user-supplied input. Processing one such document occupies a worker thread from a bounded pool for a disproportionate amount of time, degrading the availability of indexing operations on the affected node.

Severity

4.3 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-13 20:23 UTC

CWE

CWE-407 - Inefficient Algorithmic Complexity

Assigner

elastic mitre root

References

1 reference

URL	Tags
https://discuss.elastic.co/t/elasticsearch-8-19-2…

Impacted products

1 product

Vendor	Product	Version	CPE status
Elastic	Elasticsearch	Affected: 8.0.0 , ≤ 8.19.19 (semver) Affected: 9.0.0 , ≤ 9.4.4 (semver)	guessed

Show details on NVD website

JSON

To clipboard

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bit-elasticsearch-2026-72685

Vulnerability from bitnami_vulndb

Published

2026-08-19 08:39

Modified

2026-09-08 08:34

Summary

Inefficient Algorithmic Complexity in Elasticsearch Leading to Denial of Service

Details

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "elasticsearch",
        "purl": "pkg:bitnami/elasticsearch"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "8.0.0"
            },
            {
              "fixed": "8.19.20"
            },
            {
              "introduced": "9.0.0"
            },
            {
              "fixed": "9.4.5"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-72685"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:elastic:elasticsearch:*:*:*:*:*:*:*:*",
      "cpe:2.3:a:elastic:elasticsearch:*:*:*:*:*:maven:*:*"
    ],
    "severity": "Medium"
  },
  "details": "A flaw in Elasticsearch allows a low-privileged authenticated user who can index documents to submit a single small document containing a crafted user-supplied input. Processing one such document occupies a worker thread from a bounded pool for a disproportionate amount of time, degrading the availability of indexing operations on the affected node.",
  "id": "BIT-elasticsearch-2026-72685",
  "modified": "2026-09-08T08:34:36.952Z",
  "published": "2026-08-19T08:39:49.426Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://discuss.elastic.co/t/elasticsearch-8-19-20-9-4-5-security-update-esa-2026-77/389500"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72685"
    }
  ],
  "schema_version": "1.6.2",
  "summary": "Inefficient Algorithmic Complexity in Elasticsearch Leading to Denial of Service"
}

FKIE_CVE-2026-72685

Vulnerability from fkie_nvd - Published: 2026-08-13 20:17 - Updated: 2026-09-01 15:04

Severity

4.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Summary

References

	URL	Tags
	security@elastic.co	https://discuss.elastic.co/t/elasticsearch-8-19-20-9-4-5-security-update-esa-2026-77/389500	Vendor Advisory

Impacted products

	Vendor	Product	Version
	elastic	elasticsearch	*
	elastic	elasticsearch	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Elasticsearch",
          "vendor": "Elastic",
          "versions": [
            {
              "lessThanOrEqual": "8.19.19",
              "status": "affected",
              "version": "8.0.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "9.4.4",
              "status": "affected",
              "version": "9.0.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "security@elastic.co"
    }
  ],
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    }
  ],
  "id": "CVE-2026-72685",
  "lastModified": "2026-09-01T15:04:10.183",
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GHSA-5MJQ-6XVH-RMV2

Vulnerability from github – Published: 2026-08-13 21:36 – Updated: 2026-08-13 21:36

Details

Severity

4.3 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
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    "CVE-2026-72685"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-407"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-13T20:17:29Z",
    "severity": "MODERATE"
  },
  "details": "A flaw in Elasticsearch allows a low-privileged authenticated user who can index documents to submit a single small document containing a crafted user-supplied input. Processing one such document occupies a worker thread from a bounded pool for a disproportionate amount of time, degrading the availability of indexing operations on the affected node.",
  "id": "GHSA-5mjq-6xvh-rmv2",
  "modified": "2026-08-13T21:36:11Z",
  "published": "2026-08-13T21:36:11Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72685"
    },
    {
      "type": "WEB",
      "url": "https://discuss.elastic.co/t/elasticsearch-8-19-20-9-4-5-security-update-esa-2026-77/389500"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ]
}

MSRC_CVE-2026-72685

Vulnerability from csaf_microsoft - Published: 2026-08-23 14:51 - Updated: 2026-08-23 14:51

Summary

Inefficient Algorithmic Complexity in Elasticsearch Leading to Denial of Service

Scope

1 vulnerability in this advisory, including CVE-2026-72685.

CVE-2026-72685

Known not affected: 1 product

Open the full advisory

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.

Action not permitted

CVE-2026-72685 (GCVE-0-2026-72685)

bit-elasticsearch-2026-72685

Vulnerability from bitnami_vulndb

FKIE_CVE-2026-72685

GHSA-5MJQ-6XVH-RMV2

MSRC_CVE-2026-72685

Tags

Sightings

Nomenclature

Related by attack behaviour