CVE-2026-42400

MEDIUM

Uncontrolled Resource Consumption in Kibana Leading to Denial of Service

Title source: cna

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.

References (1)

Core 1

Core References

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

Scores

CVSS v3 6.5

EPSS 0.0030

EPSS Percentile 21.0%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-400

Status published

Products (4)

Elastic/Kibana 8.0.0 - 8.19.15

elastic/kibana 8.0.0 - 8.19.16

Elastic/Kibana 9.0.0 - 9.3.4

Elastic/Kibana 9.4.0 - 9.4.1

Published May 28, 2026

Tracked Since May 29, 2026