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.

CVSS 4.0

6.9CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N

CVSS 3.1

6.8CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

EPSS

0.5% chance of exploitation in the next 30 days; higher than 39% of CVEs (scores of 2026-10-25)

CWE

CWE-322

Published

2026-08-03

Modified

2026-10-23

Record from

the NVD, synced 2026-10-24

Affected

• amazon:aws_command_line_interface

Packages (OSV)

References

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

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