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

CVE-2026-18654 is fixed in 2 products on 2 platforms, first by AWS Command Line Interface 2.35.3, released June 11, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-18654
- Priority: Routine
- CVSS: 6.9 (moderate)
- EPSS: 0.0046
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 3, 2026
- Weakness: CWE-322: Key exchange without entity authentication
- Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-18654

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | AWS Command Line Interface | 2.35.3 | [AWS Command Line Interface 2.35.3](https://patchblox.com/security/data/fix/windows-app/amazon.awscli-2.35.3.md) | Jun 11, 2026 |
| Linux | awscli-2 amzn 2023 | 2.36.47-4.amzn2023.0.1 | [ALAS2023-2026-3133](https://patchblox.com/security/data/fix/linux/alas2023-2026-3133.md) | Sep 28, 2026 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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