Resource exhaustion in Elasticsearch - CVE-2026-102404
Published: October 7, 2026
Vulnerability identifier: #VU153938
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-102404
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in the Elasticsearch query processing engine when processing ES|QL queries. A remote user can submit a specially crafted query that causes uncontrolled memory growth and an out-of-memory condition that terminates the Elasticsearch node to cause a denial of service.
No special configuration is required beyond the default configuration. Queries embedded in shared resources can also trigger the condition.
Affected software
Elasticsearch
How to mitigate CVE-2026-102404
Install security update from vendor's website.
Elasticsearch - addressed in versions 8.19.23, 9.4.8, 9.5.5