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.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-3133 advisory.

    Overly permissive file permissions in AWS CLI before 1.44.78 (v1) and 2.34.29 (v2) on Unix-like systems     where the umask has not been configured to restrict file permissions (the default on most systems) may     allow other local users on the same host to read credentials written by certain CLI subcommands (aws     codeartifact login, aws iam create-virtual-mfa-device, aws deploy register).

    To remediate this issue, users should upgrade to AWS CLI 1.44.78 (v1) or 2.34.29 (v2) or later.
    (CVE-2026-13769)

    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. (CVE-2026-18654)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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.
    (CVE-2026-18654)

Note that Nessus relies on the presence of the package as reported by the vendor.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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.
    (CVE-2026-18654)

ID	Name	Product	Family	Type	Severity
351021	Amazon Linux 2023 : awscli-2 (ALAS2023-2026-3133)	Nessus	Amazon Linux Local Security Checks	Local	medium
342175	Linux Distros Unpatched Vulnerability : CVE-2026-18654	Nessus	Misc.	Local	medium
445765	SCA: security update for awscli (GHSA-hqvf-45jj-mccq)	Tenable Cloud Security	SCA Checks	Local	medium
445765	SCA: security update for awscli (GHSA-hqvf-45jj-mccq)	Tenable Self-Hosted Container Security	SCA Checks	Local	medium

Detections

Analytics

CVE-2026-18654

medium

Tenable Plugins

medium

medium

medium

medium