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6.9 Medium

CVE-2026-18654 Key exchange without entity authentication in the EMR SSH helper commands in Amazon AWS CLI before 1.45.28 and AWS CLI…

Description

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 and versions

Product Affected versions Fixed in
aws-cli 2.35 earliest → 2.35.2 No fix stated
aws-cli 1.45 earliest → 1.45.27 No fix stated
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