CVE-2025-23390

Fleet doesn’t validate a server’s certificate when connecting through SSH

Published Oct 15, 2026 CVSS 3.1 · 6.3 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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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
History
Type Values Removed Values Added
First Time appeared Suse
Suse fleet
Vendors & Products Suse
Suse fleet
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
suse
Published
Updated
Oct 15, 2026, 2:21 PM
Reserved
Jan 15, 2025, 12:39 PM
Status
Awaiting Analysis
Published
Oct 15, 2026, 9:17 AM
Modified
Oct 19, 2026, 10:10 PM