Vulnerability Report

CVE-2026-42399

Title: Kibana DoS via Timelion Visualization

DoS

Proof Of Concept

No public PoC currently indexed for CVE-2026-42399.

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-2026-42399: Uncontrolled Resource Consumption (CWE-400) in Kibana can lead to denial of service via Excessive Allocation (CAPEC-130). An authenticated low-privileged user can cause Kibana to consume exponentially increasing amounts of memory by submitting a specially crafted Timelion visualization expression containing deeply chained function calls. The resulting data structure grows without bound, exhausting available memory and causing the Kibana service to crash and become unavailable to all users.

Impacted Vendors

elastic 1

elasticsearch 1

Reference Links

https://discuss.elastic.co/t/kibana-8-19-16-and-9-3-5-security-update-esa-2026-36/386556

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-2026-42399 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.