Medium 6.8HealthcarePublished Aug 3, 2026

CVE-2026-18654Disabled SSH host key verification in Amazon AWS CLI EMR helper commands

Updated under an hour ago (Oct 27, 2026, 1:00 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 6.8 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
Weakness (CWE): CWE-322
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: AMZN
NVD analysis: Analyzed
Record last updated: Aug 4, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

AWS aws-cli aws:cli (from the name)	through 1.45.27; through 2.35.2	CNA record
amazon aws_command_line_interface amazon:aws_command_line_interface	before 1.45.28; from 2.0.0 before 2.35.3	NVD

References

References

https://github.com/aws/aws-cli/blob/develop/CHANGELOG.rst	patch, release-notes
https://github.com/aws/aws-cli/blob/v2/CHANGELOG.rst	patch, release-notes
https://aws.amazon.com/security/security-bulletins/2026-071-aws/	vendor-advisory
https://github.com/aws/aws-cli/security/advisories/GHSA-hqvf-45jj-mccq	release-notes, vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.