CVE-2026-63263 — Uncontrolled Resource Consumption in Elasticsearch Leading to Denial of Service

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
Elastic / Elasticsearch	affected 9.4.0 through 9.4.3; affected 9.0.0 through 9.3.7; affected 8.0.0 through 8.19.18

CWE

CWE-400

References

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

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.