CVE-2025-23390

A vulnerability has been identified within Fleet where, by default, Fleet will automatically trust a remote server’s certificate when connecting through SSH if the certificate isn’t set in the `known_hosts` file. This could allow the execution of a man-in-the-middle (MitM) attack against Fleet. In case the server that is being connected to has a trusted entry in the known_hosts file, then Fleet will correctly check the authenticity of the presented certificate.

CVSS v3 6.3 MEDIUM

6.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 3.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://bugzilla.suse.com/show_bug.cgi?id=CVE-2025-23390
https://github.com/rancher/fleet/security/advisories/GHSA-xgpc-q899-67p8

Configurations

No configuration.

History

19 Oct 2026, 22:10

Type	Values Removed	Values Added
Summary		(es) Se ha identificado una vulnerabilidad en Fleet donde, por defecto, Fleet confiará automáticamente en el certificado de un servidor remoto al conectarse a través de SSH si el certificado no está configurado en el archivo ’known_hosts’. Esto podría permitir la ejecución de un ataque man-in-the-middle (MitM) contra Fleet. En caso de que el servidor al que se está conectando tenga una entrada de confianza en el archivo ’known_hosts’, entonces Fleet verificará correctamente la autenticidad del certificado presentado.

15 Oct 2026, 09:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-15 09:17

Updated : 2026-10-19 22:10

NVD link : CVE-2025-23390

Mitre link : CVE-2025-23390

CVE.ORG link : CVE-2025-23390

JSON object : View

Products Affected

No product.

CWE

CWE-295

Improper Certificate Validation

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