Elasticsearch does not validate a size value taken from a user-supplied input before that value is used to reserve memory for an internal data structure. An authenticated user holding only read privileges can submit a single small crafted request to a product API endpoint that causes the node to attempt an excessively large allocation. The resulting memory exhaustion raises a fatal error that terminates the Elasticsearch node process, causing a denial of service for the affected node and degrading cluster health. The defect is not volumetric, so a single request is sufficient regardless of the heap size configured on the target node.

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Thu, 13 Aug 2026 19:30:00 +0000

Type Values Removed Values Added
Description Elasticsearch does not validate a size value taken from a user-supplied input before that value is used to reserve memory for an internal data structure. An authenticated user holding only read privileges can submit a single small crafted request to a product API endpoint that causes the node to attempt an excessively large allocation. The resulting memory exhaustion raises a fatal error that terminates the Elasticsearch node process, causing a denial of service for the affected node and degrading cluster health. The defect is not volumetric, so a single request is sufficient regardless of the heap size configured on the target node.
Title Memory Allocation with Excessive Size Value in Elasticsearch Leading to Denial of Service
Weaknesses CWE-789
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: elastic

Published:

Updated: 2026-08-13T20:34:20.569Z

Reserved: 2026-08-10T11:17:58.730Z

Link: CVE-2026-72678

cve-icon Vulnrichment

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cve-icon NVD

Status : Received

Published: 2026-08-13T20:17:28.497

Modified: 2026-08-13T20:17:28.497

Link: CVE-2026-72678

cve-icon Redhat

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cve-icon OpenCVE Enrichment

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Weaknesses