CVE-2026-18654: Aws Aws-CLI

Medium severity, CVSS 6.8. EPSS: 0.3% chance of exploitation in the next 30 days.

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 remediate this issue, users should upgrade to AWS CLI v1 1.45.28 or later, or AWS CLI v2 2.35.3 or later.

Affected products

• Aws Aws-CLI: up to and including 1.45.27; up to and including 2.35.2

Published 2026-08-03. Last modified 2026-08-04.