CVE-2026-63263: Uncontrolled Resource Consumption in Elasticsearch Leading to Denial of Service
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 Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-63263?
CVE-2026-63263 has a severity rating of medium with a score of 6.5.
How do I fix CVE-2026-63263?
To fix CVE-2026-63263, update your Elastic Elasticsearch to the latest version that addresses this vulnerability.
What impact does CVE-2026-63263 have on my system?
CVE-2026-63263 can lead to denial of service due to uncontrolled resource consumption.
Who is affected by CVE-2026-63263?
CVE-2026-63263 affects authenticated users of Elastic Elasticsearch who can submit specially crafted queries.
What is the nature of the vulnerability described in CVE-2026-63263?
CVE-2026-63263 involves uncontrolled resource consumption leading to exponential CPU usage during query evaluation.