CVE-2026-18654

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Exploit odds

0.5% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-08-03 20:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-10-23 21:10 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.5% in the next 30 days (EPSS).
• Severity: 6.9 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2026-08-03 20:17 UTC

Last modified

2026-10-23 21:10 UTC

Exploit probability

0.5% · EPSS, next 30 days

Weakness

CWE-322

Record status

Analyzed

Affected

• Amazon Aws Command Line Interface < 1.45.28
• Amazon Aws Command Line Interface < 2.35.3

Attack profile CVSS 4.0 · 6.9

Attack vector

Network

Complexity

High

Attack requirements

Present

Privileges needed

None

User interaction

None

Confidentiality

None

Integrity

None

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2026-18654.md and follow it. Check whether this project is affected by CVE-2026-18654. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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