CVE-2026-72645

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

State: Published
Severity: 6.5 Medium
Published: Aug 13, 2026
Updated: Aug 13, 2026
Reserved: Aug 10, 2026

Description

Memory Allocation with Excessive Size Value (CWE-789) in Elasticsearch can lead to denial of service via Excessive Allocation (CAPEC-130). An authenticated user holding only read privileges on a single index can submit one small, specially crafted search request that causes an excessively large memory allocation, exhausting the JVM heap and terminating the affected node.

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	elastic

Weaknesses

CWE-789 Memory Allocation with Excessive Size Value

Affected Products

Product	Versions
ElasticsearchElastic	8.0.0 through 8.19.19Affected 9.0.0 through 9.4.4Affected 9.5.0Affected

References

https://discuss.elastic.co/t/elasticsearch-8-19-20-9-4-5-9-5-1-security-update-esa-2026-116/389502

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