CVE-2026-18654
Disabled SSH host key verification in Amazon AWS CLI EMR helper commands
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.
INFO
Published Date :
Aug. 3, 2026, 8:17 p.m.
Last Modified :
Oct. 23, 2026, 9:10 p.m.
Remotely Exploit :
Yes !
Source :
ff89ba41-3aa1-4d27-914a-91399e9639e5
Affected Products
The following products are affected by CVE-2026-18654
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | ff89ba41-3aa1-4d27-914a-91399e9639e5 | ||||
| CVSS 3.1 | MEDIUM | MITRE-CVE | ||||
| CVSS 4.0 | MEDIUM | ff89ba41-3aa1-4d27-914a-91399e9639e5 | ||||
| CVSS 4.0 | MEDIUM | ff89ba41-3aa1-4d27-914a-91399e9639e5 |
Solution
- Upgrade AWS CLI v1 to 1.45.28 or later.
- Upgrade AWS CLI v2 to 2.35.3 or later.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-18654.
| URL | Resource |
|---|---|
| https://aws.amazon.com/security/security-bulletins/2026-071-aws/ | Vendor Advisory |
| https://github.com/aws/aws-cli/blob/develop/CHANGELOG.rst | Release Notes |
| https://github.com/aws/aws-cli/blob/v2/CHANGELOG.rst | Release Notes |
| https://github.com/aws/aws-cli/security/advisories/GHSA-hqvf-45jj-mccq | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-18654 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-18654
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-18654 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-18654 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Oct. 23, 2026
Action Type Old Value New Value Added Translation Title: aws-cli de AWS, Description: El intercambio de claves sin autenticación de entidad en los comandos auxiliares SSH de EMR en Amazon AWS CLI anterior a 1.45.28 y AWS CLI v2 anterior a 2.35.3 podría permitir a atacantes man-in-the-middle interceptar sesiones SSH y transferencias de archivos mediante posicionamiento de red entre el cliente y el punto final del clúster EMR. Para remediar este problema, los usuarios deben actualizar a AWS CLI v1 1.45.28 o posterior, o AWS CLI v2 2.35.3 o posterior. -
Initial Analysis by [email protected]
Oct. 23, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:amazon:aws_command_line_interface:*:*:*:*:*:*:*:* versions up to (excluding) 1.45.28 *cpe:2.3:a:amazon:aws_command_line_interface:*:*:*:*:*:*:*:* versions from (including) 2.0.0 up to (excluding) 2.35.3 Added Reference Type AMZN: https://aws.amazon.com/security/security-bulletins/2026-071-aws/ Types: Vendor Advisory Added Reference Type AMZN: https://github.com/aws/aws-cli/blob/develop/CHANGELOG.rst Types: Release Notes Added Reference Type AMZN: https://github.com/aws/aws-cli/blob/v2/CHANGELOG.rst Types: Release Notes Added Reference Type AMZN: https://github.com/aws/aws-cli/security/advisories/GHSA-hqvf-45jj-mccq Types: Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 04, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-18654', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-08-04T19:32:18.898182Z'} -
New CVE Received by ff89ba41-3aa1-4d27-914a-91399e9639e5
Aug. 03, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'AWS', 'product': 'aws-cli', 'versions': [{'status': 'affected', 'version': '0', 'versionType': 'custom', 'lessThanOrEqual': '1.45.27'}, {'status': 'affected', 'version': '0', 'versionType': 'custom', 'lessThanOrEqual': '2.35.2'}], 'defaultStatus': 'unaffected'}] Added 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. Added CVSS V4.0 AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N Added CWE CWE-322 Added Reference https://aws.amazon.com/security/security-bulletins/2026-071-aws/ Added Reference https://github.com/aws/aws-cli/blob/develop/CHANGELOG.rst Added Reference https://github.com/aws/aws-cli/blob/v2/CHANGELOG.rst Added Reference https://github.com/aws/aws-cli/security/advisories/GHSA-hqvf-45jj-mccq