CVE-2026-18654
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Key Exchange Without Authentication in AWS CLI

Publication date: 2026-08-03

Last updated on: 2026-08-04

Assigner: AMZN

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.

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Meta Information

Published
2026-08-03
Last Modified
2026-08-04
Generated
2026-08-24
AI Q&A
2026-08-03
EPSS Evaluated
2026-08-22
NVD
CVE-2026-18654
EUVD
EUVD-2026-52415

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
amazon aws_cli From 1.45.28 (inc)
amazon aws_cli From 2.35.3 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-322 The product performs a key exchange with an actor without verifying the identity of that actor.

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Executive Summary

This vulnerability involves key exchange without entity authentication in the EMR SSH helper commands of Amazon AWS CLI. It allows man-in-the-middle attackers to intercept SSH sessions and file transfers by positioning themselves between the client and the EMR cluster endpoint.

Detection Guidance

This vulnerability involves key exchange without entity authentication in AWS CLI EMR SSH helper commands. Detection requires checking AWS CLI versions and monitoring for unusual SSH session activity. Use 'aws --version' to verify CLI version. If using vulnerable versions (v1 <1.45.28 or v2 <2.35.3), update immediately. Monitor network traffic for unexpected SSH connections to EMR clusters.

Impact Analysis

An attacker could intercept sensitive data during SSH sessions or file transfers, potentially gaining unauthorized access to confidential information or manipulating data in transit.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, which may violate compliance requirements such as GDPR or HIPAA, potentially resulting in legal penalties or reputational damage.

Mitigation Strategies
  • Upgrade AWS CLI v1 to version 1.45.28 or later.
  • Upgrade AWS CLI v2 to version 2.35.3 or later.

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