{"cve":"CVE-2025-23390","nvd":{"published":"2026-10-15T09:17:14.190","modified":"2026-10-19T22:10:00.130","status":"Awaiting Analysis","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L","score":6.3},"cwes":["CWE-295"],"references":["https://bugzilla.suse.com/show_bug.cgi?id=CVE-2025-23390","https://github.com/rancher/fleet/security/advisories/GHSA-xgpc-q899-67p8"],"products":[],"source":"nvd","synced_at":"2026-10-21T03:56:58.798400159+00:00"},"epss":{"cve":"CVE-2025-23390","score":0.0019,"percentile":0.08612,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-xgpc-q899-67p8","url":"https://osv.dev/vulnerability/GHSA-xgpc-q899-67p8","summary":"Fleet doesn’t validate a server’s certificate when connecting through SSH","modified":"2025-05-05T22:00:39Z","packages":[{"ecosystem":"Go","name":"github.com/rancher/fleet","purl":"pkg:golang/github.com/rancher/fleet","ranges":[">=0.9.0-rc.1 <0.10.12"],"fixed":["0.10.12"]},{"ecosystem":"Go","name":"github.com/rancher/fleet","purl":"pkg:golang/github.com/rancher/fleet","ranges":[">=0.11.0 <0.11.7"],"fixed":["0.11.7"]},{"ecosystem":"Go","name":"github.com/rancher/fleet","purl":"pkg:golang/github.com/rancher/fleet","ranges":[">=0.12.0 <0.12.2"],"fixed":["0.12.2"]}]},{"id":"GO-2025-3649","url":"https://osv.dev/vulnerability/GO-2025-3649","summary":"Fleet doesn’t validate a server’s certificate when connecting through SSH in github.com/rancher/fleet","modified":"2026-03-03T04:57:15.677721Z","packages":[{"ecosystem":"Go","name":"github.com/rancher/fleet","purl":"pkg:golang/github.com/rancher/fleet","ranges":[">=0.9.0-rc.1 <0.10.12",">=0.11.0 <0.11.7",">=0.12.0 <0.12.2"],"fixed":["0.10.12","0.11.7","0.12.2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}