Input validation error in Kibana - CVE-2026-56151
Published: July 2, 2026
Vulnerability identifier: #VU136679
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-56151
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Elastic Stack
Affected software:
Kibana
Kibana
Detailed vulnerability description
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.
How to mitigate CVE-2026-56151
Install security update from vendor's website.