Uncontrolled Recursion in Elasticsearch - CVE-2026-63144
Published: July 22, 2026
Vulnerability identifier: #VU139145
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-2026-63144
CWE-ID: CWE-674
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 recursion in the Elasticsearch query evaluation component when processing search requests. A remote user can send a specially crafted search request to cause a denial of service.
A user with read-level index access is required. In single-node deployments, exploitation can cause a complete service outage; in multi-node clusters, it can cause repeated node restarts and sustained availability degradation.
Affected software
Elasticsearch
How to mitigate CVE-2026-63144
Install security update from vendor's website.
Elasticsearch - addressed in versions 8.19.19, 9.3.8, 9.4.4