CVE-2026-63263

Uncontrolled Resource Consumption in Elasticsearch Leading to Denial of Service

State: Published
Severity: 6.5 Medium
Published: Jul 21, 2026
Updated: Jul 22, 2026
Reserved: Jul 16, 2026

Description

Uncontrolled Resource Consumption (CWE-400) in Elasticsearch can lead to denial of service via Exponential Data Expansion (CAPEC-197). An authenticated user may submit a specially crafted query to the ES|QL engine that causes exponential CPU consumption during query evaluation. Because the resource exhaustion persists beyond query completion, repeated requests can fully exhaust the available query worker resources, rendering ES|QL queries unavailable until the node is restarted.

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-400 Uncontrolled Resource Consumption

Affected Products

Product	Versions
ElasticsearchElastic	9.4.0 through 9.4.3Affected 9.0.0 through 9.3.7Affected 8.0.0 through 8.19.18Affected

References

https://discuss.elastic.co/t/elasticsearch-8-19-19-9-3-8-9-4-4-security-update-esa-2026-74/388577

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