Resource exhaustion in Kibana - CVE-2026-42400
Published: May 29, 2026
Vulnerability identifier: #VU132760
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-42400
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in Kibana request processing when handling a specially crafted compressed request payload prior to authorization checks. A remote user can send a specially crafted compressed request payload to cause a denial of service.
All Kibana configurations accessible to authenticated users are affected.
Affected software
Kibana
How to mitigate CVE-2026-42400
Install security update from vendor's website.
Kibana - addressed in versions 8.19.16, 9.3.5, 9.4.2