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

Quick assessment

Affected
AWS aws-cli
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Amazon aws-cli是美国Amazon公司的一个与云服务交互的命令行工具。 Amazon aws-cli 1.45.28之前版本和AWS CLI v2 2.35.3之前版本存在加密问题漏洞，该漏洞源于EMR SSH helper命令中的密钥交换缺少实体认证，可能导致中间人攻击者通过客户端与EMR集群端点之间的网络定位拦截SSH会话和文件传输。

CVSS 6.8 · Medium EPSS 0.29% · P20

Affected Version Matrix 2

VendorProduct Version RangeStatus
AWS aws-cli ≤ 1.45.27 affected
≤ 2.35.2 affected
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I. Basic Information for CVE-2026-18654

Vulnerability Information
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Vulnerability Title
Disabled SSH host key verification in Amazon AWS CLI EMR helper commands
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
未进行实体认证的密钥交换
Source: CVE Program / CVE List V5
Vulnerability Title
Amazon aws-cli 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Amazon aws-cli是美国Amazon公司的一个与云服务交互的命令行工具。 Amazon aws-cli 1.45.28之前版本和AWS CLI v2 2.35.3之前版本存在加密问题漏洞，该漏洞源于EMR SSH helper命令中的密钥交换缺少实体认证，可能导致中间人攻击者通过客户端与EMR集群端点之间的网络定位拦截SSH会话和文件传输。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
AWS aws-cli 0 ~ 1.45.27 -

II. Public POCs for CVE-2026-18654

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III. Intelligence Information for CVE-2026-18654

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Vendor Advisories for CVE-2026-18654 (2)

Vendor Pages for CVE-2026-18654 (1)

Same Patch Batch · AWS · 2026-08-03 · 3 CVEs total

CVE-2026-18733 8.8 HIGH Prompt injection bypasses shell tool consent gate in Strands Agents Tools
CVE-2026-18655 6.5 MEDIUM Broker Credential and OAuth Token Disclosure in AWS Labs Amazon MQ MCP Server via Prompt I

IV. Related Vulnerabilities

Same vendor: AWS
Same weakness: CWE-322

V. Comments for CVE-2026-18654

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