Medium severity · published Aug 3, 2026
CVE-2026-18654
Disabled SSH host key verification in Amazon AWS CLI EMR helper commands
6.8
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 40% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AW
aws-cli · AWS
through 1.45.27; through 2.35.2 · source: vendor
AC
Aws Command Line Interface · Amazon
before 1.45.28; 2.0.0 before 2.35.3 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-18654
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-18654
Vendor Advisory
https://aws.amazon.com/security/security-bulletins/2026-071-aws/
Release Notes
https://github.com/aws/aws-cli/blob/develop/CHANGELOG.rst
Release Notes
https://github.com/aws/aws-cli/blob/v2/CHANGELOG.rst
Vendor Advisory
https://github.com/aws/aws-cli/security/advisories/GHSA-hqvf-45jj-mccq
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