Resource exhaustion in Elasticsearch - CVE-2026-63136
Published: July 22, 2026
Vulnerability identifier: #VU139149
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-2026-63136
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 search request handling functionality when processing a specially crafted search request. A remote user can submit a specially crafted search request to cause a denial of service.
The issue can exhaust heap memory on a data node, resulting in node unavailability and cluster degradation that may require manual intervention to restore service.
Affected software
Elasticsearch
How to mitigate CVE-2026-63136
Install security update from vendor's website.
Elasticsearch - addressed in versions 8.19.15, 9.2.9, 9.3.4