Resource exhaustion in Elasticsearch - CVE-2026-49090
Published: July 2, 2026
Vulnerability identifier: #VU136669
CSH Severity: Medium
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-2026-49090
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 bulk API when processing a specially crafted bulk request. A remote user can submit a specially crafted bulk request to cause a denial of service.
The issue can cause sustained high CPU consumption and render the affected node unable to process requests.
Affected software
Elasticsearch
How to mitigate CVE-2026-49090
Install security update from vendor's website.
Elasticsearch - addressed in versions 7.17.24, 8.15.0