Uncontrolled Resource Consumption in Kibana Leading to Denial of Service
Uncontrolled Resource Consumption (CWE-400) in Kibana can lead to denial of service via Excessive Allocation (CAPEC-130). An authenticated attacker with low-privilege access can trigger a denial of service condition in Kibana by sending a specially crafted, oversized request payload. Processing this user-supplied input requires resource-intensive memory allocation that can exhaust the available heap memory in the Kibana process, causing it to crash and become unavailable to all users.
Affected Versions:
- 8.x: All versions from 8.0.0 up to and including 8.19.18
- 9.x:
- All versions from 9.0.0 up to and including 9.3.7
- All versions from 9.4.0 up to and including 9.4.3
Users on Kibana 9.5.0 and later are not affected by this vulnerability.
Affected Configurations:
- All Kibana deployments are affected. Exploitation requires an authenticated Kibana user with low-privilege access.
Solutions and Mitigations:
The issue is resolved in Kibana versions 8.19.19, 9.3.8, and 9.4.4. Users are advised to upgrade to one of these versions or later.
For Users that Cannot Upgrade:
- There are no workarounds for this vulnerability.
Indicators of Compromise (IOC)
No specific indicators of compromise have been identified for this vulnerability.
Elastic Cloud Serverless
Due to our continuous deployment and patching model, the vulnerability described in this security advisory was remediated in our Elastic Cloud Serverless offering before the public disclosure.
Severity: CVSSv3.1: Medium ( 6.5 ) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVE ID: CVE-2026-63260
Problem Type: CWE-400 - Uncontrolled Resource Consumption
Impact: CAPEC-130 - Excessive Allocation