Uncontrolled Recursion in Elasticsearch - CVE-2026-103006
Published: October 7, 2026
Vulnerability identifier: #VU153941
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-2026-103006
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 Elasticsearch's search aggregation processing when processing deeply nested aggregation definitions. A remote user can submit a specially crafted request to the aggregation feature of the search API to cause a denial of service.
Exploitation requires read access to a single index. All configurations are affected, and the vulnerable functionality is enabled by default.
Affected software
Elasticsearch
How to mitigate CVE-2026-103006
Install security update from vendor's website.
Elasticsearch - addressed in versions 8.19.21, 9.4.6, 9.5.2