Input validation error in Kibana - CVE-2026-56151
Published: July 2, 2026
Vulnerability identifier: #VU136679
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-2026-56151
CWE-ID: CWE-20
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 improper input validation in Fleet policy input handling when processing a specially crafted Fleet policy input. A remote user can submit a specially crafted Fleet policy input to cause a denial of service.
Only deployments that use Fleet are vulnerable.
Affected software
Kibana
How to mitigate CVE-2026-56151
Install security update from vendor's website.
Kibana - addressed in versions 8.19.17, 9.3.6, 9.4.3