CVE-2026-18654mediumCWE-322

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

13Vexday Risk Score

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

ssvc Trackcvss 6.9epss 0.3%

exploitation probability

0.3%top 79% of all CVEs

observed exploitation

nono source reports it

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