Is CVE-2026-63263 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-63263?

CVE-2026-63263 has a CVSS v3 severity of MEDIUM (6.5).

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CVE-2026-63263

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.