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 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.
- Published Aug 3, 2026
- CVSS 6.9 medium
- 0.3% chance of exploitation in the next 30 days (EPSS)
- A fix is available
Affected software
In the news
- CVE-2026-18654 - Disabled SSH host key verification in AWS CLI EMR helper commands AWS Security Bulletins ·