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CVE-2026-72656

Memory Allocation with Excessive Size Value in Elasticsearch Leading to Denial of Service

Published: Aug 13, 2026Updated: Sep 4, 2026 Sources: CVE List NVDCWE-789
6.5MEDIUM
NVD MITRE
EPSS Score
0.3%
Top 78.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

Memory Allocation with Excessive Size Value (CWE-789) in the ES|QL query processing of Elasticsearch can lead to denial of service via Excessive Allocation (CAPEC-130). An authenticated user able to submit ES|QL queries could send a specially crafted query whose evaluation allocates an unbounded amount of heap memory, exhausting the available heap on the receiving node and causing the node to become unavailable.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-789

Affected Products

Elastic
commercial·USaka elastic.co, elasticsearch co.
ElasticsearchOn-premDatabase
Databases
and 1 more affected products View all →

Exploitability

Official Patch Available
Is your org exposed to CVE-2026-72656?We can run the check for you — a free external exposure review, no install. Check my exposure

References

https://discuss.elastic.co/t/elasticsearch-8-18-0-9-0-0-security-update-esa-2026-111/389495
discuss.elastic.co

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