CVE-2026-18654mediumCWE-322

CVE-2026-18654: medium-severity vulnerability in aws-cli

Disabled SSH host key verification in Amazon AWS CLI EMR helper commands

Published 03 Aug 2026 · Updated 04 Aug 2026

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13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 6.9epss 0.5%

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

Affected products

AWS · aws-cli

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