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.
Advisories
Source ID Title
EUVD EUVD EUVD-2025-12541 Fleet doesn’t validate a server’s certificate when connecting through SSH
Github GHSA Github GHSA GHSA-xgpc-q899-67p8 Fleet doesn’t validate a server’s certificate when connecting through SSH
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Thu, 15 Oct 2026 13:30:00 +0000

Type Values Removed Values Added
Description 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.
Title Fleet doesn’t validate a server’s certificate when connecting through SSH
Weaknesses CWE-295
References
Metrics cvssV3_1

{'score': 6.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: suse

Published:

Updated: 2026-10-15T14:21:33.655Z

Reserved: 2025-01-15T12:39:03.324Z

Link: CVE-2025-23390

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-15T09:17:14.190

Modified: 2026-10-15T09:17:14.190

Link: CVE-2025-23390

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses