Memory Allocation Vulnerability in Elasticsearch by Elastic
CVE-2026-72656

6.5MEDIUM

Key Information:

Vendor

Elastic
Status
Elastic
Vendor
CVE Published:
13 August 2026

What is CVE-2026-72656?

A vulnerability exists in Elasticsearch's ES|QL query processing that allows an authenticated user to send a specially crafted query. This can trigger excessive memory allocation, leading to denial of service by exhausting heap memory on the receiving node. As a result, the affected node may become unavailable, disrupting normal operations.

Affected Version(s)

Elasticsearch 8.11.0 <= 8.17.9

References

https://discuss.elastic.co/t/elasticsearch-8-18-0-9-0-0-s...

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.