CVE-2026-72647Network attack vectorHinoki check available

Authenticated node crash via unbounded search recursion

Published Aug 13, 2026 · Updated Aug 13, 2026

Uncontrolled recursion in Elastic Elasticsearch 8.0.0 through 8.19.19 and 9.0.0 through 9.4.4 allows remote authenticated users to crash a node. The default search API retriever framework processes deeply nested request structures without a depth limit until thread-stack exhaustion terminates the node. Read access to one index is sufficient; the reported consequence is node termination, without confidentiality or integrity impact.

CVSS severity6.5
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Uncontrolled recursion in Elastic Elasticsearch 8.0.0 through 8.19.19 and 9.0.0 through 9.4.4 allows remote authenticated users to crash a node. The default search API retriever framework processes deeply nested request structures without a depth limit until thread-stack exhaustion terminates the node. Read access to one index is sufficient; the reported consequence is node termination, without confidentiality or integrity impact.

The record

CVE
CVE-2026-72647
Published
Aug 13, 2026
Updated
Aug 13, 2026
Vendor
Elastic
Product
Elasticsearch
Classifications
CWE-674, CAPEC-230, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=8.0.0 <=8.19.19
  2. Affected versionversion=9.0.0 <=9.4.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Elastic · Elasticsearchversion=8.0.0 <=8.19.19; version=9.0.0 <=9.4.4

Published CVSS scores

6.5ElasticCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-674Uncontrolled Recursion
CAPEC-230Serialized Data with Nested Payloads
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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