CVE-2026-18654
Medium
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.
SeverityMedium
CVSS6.8
Exploit probability—
ProductAmazon Aws Command Line Interface
PublishedAug 3, 2026
First seenAug 3, 2026
Weakness typeCWE-322CWE-322
How to fix
Update
- amazon aws_command_line_interface1.45.28, 2.35.3 or later
- awscli1.45.28 or later
Patches
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| amazon aws_command_line_interface | v < 1.45.28, 2.0.0 ≤ v < 2.35.3 | 1.45.28, 2.35.3 |
| awscliPyPI | v < 1.45.28 | 1.45.28 |
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