CVE-2026-63263

MEDIUM

Uncontrolled Resource Consumption in Elasticsearch Leading to Denial of Service

Title source: cna

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.

References (1)

Core 1

Core References

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

Scores

CVSS v3 6.5

EPSS 0.0024

EPSS Percentile 14.6%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-400

Status published

Products (3)

Elastic/Elasticsearch 8.0.0 - 8.19.18

Elastic/Elasticsearch 9.0.0 - 9.3.7

Elastic/Elasticsearch 9.4.0 - 9.4.3

Published Jul 22, 2026

Tracked Since Jul 22, 2026