---
id: CVE-2026-42400
title: >-
  Uncontrolled Resource Consumption (CWE-400) in Kibana can lead to denial of
  service via Excessive Allocation (CAPEC-130)
summary: >-
  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
  authorizat…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-400
vendor: elastic
product: kibana
affected:
  - 'kibana >= 8.0.0, < 8.19.16'
  - 'kibana >= 9.0.0, < 9.3.5'
  - 'kibana >= 9.4.0, < 9.4.2'
patched:
  - kibana 9.4.2
published: '2026-05-28'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T20:10:00.190'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-42400'
references:
  - url: >-
      https://discuss.elastic.co/t/kibana-8-19-16-9-3-5-9-4-2-security-update-esa-2026-35/386554
    label: security@elastic.co
tags:
  - nvd
epss: 0.00472
epssPercentile: 0.39246
ingestedAt: '2026-10-14T20:53:12.345Z'
---

## Overview

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.

## Affected

- `kibana >= 8.0.0, < 8.19.16`
- `kibana >= 9.0.0, < 9.3.5`
- `kibana >= 9.4.0, < 9.4.2`

## Remediation

Upgrade past the affected range:

- `kibana 9.4.2`