CVE-2026-42400

Uncontrolled Resource Consumption in Kibana Leading to Denial of Service

State: Published
Severity: 6.5 Medium
Published: May 28, 2026
Updated: May 29, 2026
Reserved: Apr 27, 2026

Description

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.

Scores

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

Weaknesses

CWE-400 Uncontrolled Resource Consumption

Affected Products

Product	Versions
KibanaElastic	9.4.0 through 9.4.1Affected 9.0.0 through 9.3.4Affected 8.0.0 through 8.19.15Affected

References

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

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