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.

Score

CVSS 4.0 6.9 Medium

Status

Analyzed - ff89ba41-3aa1-4d27-914a-91399e9639e5

Published

2026-08-03

Last modified

2026-10-23

Weaknesses

CWE-322

Affected products

• Aws Command Line Interface (Amazon)
• Aws-cli (Aws)

References

• https://github.com/aws/aws-cli/blob/develop/CHANGELOG.rst
• https://github.com/aws/aws-cli/blob/v2/CHANGELOG.rst
• https://aws.amazon.com/security/security-bulletins/2026-071-aws/
• https://github.com/aws/aws-cli/security/advisories/GHSA-hqvf-45jj-mccq