6.9

CVE-2026-18654: aws aws-cli

CVSS: 6.9v4.0MediumAwaiting analysis
AliasesGHSA-hqvf-45jj-mccqPYSEC-2026-3627CGA-2jgc-whfr-56vq
Published 03-08-2026Last modified 04-08-2026
Open JSON

Vulnerability summary

CVE-2026-18654 is a medium (CVSS 6.9) vulnerability in aws aws-cli. EPSS estimates a 0.29% chance of exploitation in the next 30 days, higher than 20.3% of scored vulnerabilities.

Overall risk
28/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.9/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.29%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 0 · Related 1
CGA-P48R-WJ7X-P8HX

Timeline

  1. 03-08-2026
    PublishedVulnerability first disclosed.
  2. 04-08-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

7 scores · 4 sources · 2 versions

EPSS trend

Probability

0.29%

Chance of exploitation in the next 30 days

Percentile

20%

Versus all other CVEs

30-day change

0.00 pp

From 0.29% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.29%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard2 products
  • localstack< 4.14.0-r22
  • py3.12-aws-cli-1All versions (No fix recorded)
Aws1 product
PyPI1 product
  • awscli< 1.45.28

3 vendors · 4 products

References

10 links