CVE-2026-42400

Name: CVE-2026-42400
Creator: NVD / NIST
Published: 2026-05-28T21:16:30.497+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.30%

Last modified Jun 17, 2026

CVE-2026-42400 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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.. EPSS estimates a 0.30% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.30%

21.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-400

Affected Software

Vendor	Product	Versions
Elastic	Kibana	>= 8.0.0, < 8.19.16
Elastic	Kibana	>= 9.0.0, < 9.3.5
Elastic	Kibana	>= 9.4.0, < 9.4.2

References

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

Timeline

Published: May 28, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-42400?

How severe is CVE-2026-42400?

CVE-2026-42400 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.30% probability of exploitation in the next 30 days.

How do I fix CVE-2026-42400?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-42400?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST