CVE-2025-23390

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

State: Published
Severity: 6.3 Medium
Published: Oct 15, 2026
Updated: Oct 15, 2026
Reserved: Jan 15, 2025

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.

Scores

CVSS	Score	Vector	Source
3.1	6.3 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L	suse

Weaknesses

CWE-295 Improper certificate validation

Affected Products

Product	Versions
fleetSUSE	0.9.0-rc.1 to before 0.10.12Affected 0.11.0 to before 0.11.7Affected 0.12.0 to before 0.12.2Affected

References

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