Allocation of Resources Without Limits or Throttling in Elasticsearch - CVE-2026-102411
Published: October 7, 2026
Vulnerability identifier: #VU153934
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-2026-102411
CWE-ID: CWE-770
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 allocation of resources without limits or throttling in Elasticsearch's template resource metadata retrieval mechanism when retrieving multiple template resources together. A remote user can register multiple template resources with metadata within the individual size limit and retrieve them together to cause a denial of service by exhausting the affected node's available heap memory.
Exploitation requires the manage_index_templates cluster privilege.
Affected software
Elasticsearch
How to mitigate CVE-2026-102411
Install security update from vendor's website.
Elasticsearch - addressed in versions 8.19.23, 9.4.7, 9.5.3