CVE-2026-42400 PUBLISHED

Uncontrolled Resource Consumption in Kibana Leading to Denial of Service

Assigner: elastic
Reserved: 27.04.2026 Published: 28.05.2026 Updated: 28.05.2026

Uncontrolled Resource Consumption (CWE-400) in Kibana can lead to denial of service via Excessive Allocation (CAPEC-130). An authenticated user can send a specially crafted compressed request payload that is processed prior to authorization checks, causing excessive memory and CPU resource consumption that can result in a Kibana instance becoming unresponsive or crashing.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS Score: 6.5

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	Low	Integrity Impact	None
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	Elastic
Product	Kibana
Versions	Default: unaffected affected from 9.4.0 to 9.4.1 (incl.) affected from 9.0.0 to 9.3.4 (incl.) affected from 8.0.0 to 8.19.15 (incl.)

References

https://discuss.elastic.co/t/kibana-8-19-16-9-3-5-9-4-2-security-update-esa-2026-35/386554

Problem Types

CWE-400 Uncontrolled Resource Consumption CWE

Impacts

CAPEC-130 Excessive Allocation