Allocation of Resources Without Limits or Throttling in Elasticsearch - CVE-2026-56149
Published: July 2, 2026
Vulnerability identifier: #VU136671
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-56149
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Elastic Stack
Affected software:
Elasticsearch
Elasticsearch
Detailed vulnerability description
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 the machine learning request handling functionality when processing a specially crafted machine learning request. A remote privileged user can submit a specially crafted machine learning request to cause a denial of service.
Only deployments that use machine learning are vulnerable. Exploitation requires privileges to create or manage trained models.
How to mitigate CVE-2026-56149
Install security update from vendor's website.