AWS CLI: Disabled SSH host key verification in Amazon AWS CLI EMR helper commands

Summary The AWS Command Line Interface AWS CLI is a unified tool to manage AWS services from the command line. An issue exists where the EMR SSH helper commands aws emr ssh, aws emr socks, aws emr put, aws emr get passed StrictHostKeyChecking=no to the underlying SSH client, disabling host key...

CVE-2026-18654

This CVE (CVE-2026-18654) affects the EMR SSH helper commands in the Amazon AWS CLI. The issue is “Key exchange without entity authentication,” enabling potential MITM attackers to intercept SSH sessions and file transfers when connecting to an EMR cluster endpoint. Affected products are AWS CLI ...

CVE-2026-18654 Disabled SSH host key verification in Amazon AWS CLI EMR helper commands

Key exchange without entity authentication in the EMR SSH helper commands in Amazon AWS CLI before 1.45.28 and AWS CLI v2 before 2.35.3 might allow man-in-the-middle attackers to intercept SSHsessions and file transfers via network positioning between the client and the EMR cluster endpoint. To...

PT-2026-67492

Key exchange without entity authentication in the EMR SSH helper commands in Amazon AWS CLI before 1.45.28 and AWS CLI v2 before 2.35.3 might allow man-in-the-middle attackers to intercept SSHsessions and file transfers via network positioning between the client and the EMR cluster endpoint. To...