Vulnerability Report

CVE-2026-42400

Title: Kibana DoS via Excessive Allocation

DoS

Proof Of Concept

No public PoC currently indexed for CVE-2026-42400.

CWE Category CWE-400

Published Date May 28, 2026

Modified Date Jun 01, 2026

Exploit Status Not Found

Score 6.5 CVSS v3.1

Exploit Probability (EPSS)

0.30%

Vulnerability Summary

CVE-2026-42400: 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.

Impacted Vendors

elastic 1

elasticsearch 1

Reference Links

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

CVSS v3.1

Source Entity [email protected]

Severity MEDIUM

6.5

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

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

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-42400 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

June 01, 2026 MODIFIED

Vulnerability data updated via NVD.

May 29, 2026 MODIFIED

Vulnerability data updated via NVD.

May 28, 2026 MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity LOW

Privileges N/A

Interaction NONE

CVSS Vector String


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

Affected Stack

No specific products linked.