CVE-2025-23390CWE-295

CVE-2025-23390

Medium · published October 15, 2026

CVSS v3.1
6.3
EPSS
0%
Percentile
8.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
CVSS v4.0
Not supplied
EPSS
0.00190 · 8.2th percentile
Weakness
CWE-295 · Improper Certificate Validation
Published
2026-10-15T13:17Z
References (2)
https://bugzilla.suse.com/show_bug.cgi?id=CVE-2025-23390 · [email protected]https://github.com/rancher/fleet/security/advisories/GHSA-xgpc-q899-67p8 · [email protected]
EPSS history
Timeline
  • 16 OCT 03:24Z
    EPSS moved — → 0%
    epss
  • 15 OCT 08:16Z
    Fleet doesn’t validate a server’s certificate when connecting through SSH
    cvelistv5
  • 15 OCT 08:16Z
    Fleet doesn’t validate a server’s certificate when connecting through SSH
    cvelistv5