CVE-2026-18654

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

Published Aug 3, 2026 CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-hqvf-45jj-mccq AWS CLI: Disabled SSH host key verification in Amazon AWS CLI EMR helper commands
History
Type Values Removed Values Added
First Time appeared Amazon
Amazon aws Command Line Interface
CPEs cpe:2.3:a:amazon:aws_command_line_interface:*:*:*:*:*:*:*:*
Vendors & Products Amazon
Amazon aws Command Line Interface
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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.
Title Disabled SSH host key verification in Amazon AWS CLI EMR helper commands
First Time appeared Aws
Aws aws-cli
Weaknesses CWE-322
CPEs cpe:2.3:a:aws:aws-cli:*:*:*:*:*:*:*:*
Vendors & Products Aws
Aws aws-cli
References
Metrics cvssV3_1

{'score': 6.8, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N'}

cvssV4_0

{'score': 6.9, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
AMZN
Published
Updated
Aug 4, 2026, 7:32 PM
Reserved
Aug 3, 2026, 1:07 PM
Status
Analyzed
Published
Aug 3, 2026, 8:17 PM
Modified
Oct 23, 2026, 9:10 PM