Vulnerability in AWS Aws-Cli
CVE-2026-18654
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.
EPSS: 0.003 (21.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N.
Affected products
- Aws Aws-cli — versions 0
Weakness classification (CWE)
References
- ff89ba41-3aa1-4d27-914a-91399e9639e5 (vendor-advisory)
- ff89ba41-3aa1-4d27-914a-91399e9639e5 (release-notes, patch)
- ff89ba41-3aa1-4d27-914a-91399e9639e5 (release-notes, patch)
- ff89ba41-3aa1-4d27-914a-91399e9639e5 (release-notes)
Frequently asked questions
- What is CVE-2026-18654?
- CVE-2026-18654 is a medium-severity vulnerability in AWS Aws-Cli, classified under Key Exchange without Entity Authentication. CVSS score: 6.8/10. Published 2026-08-03.
- How severe is CVE-2026-18654?
- Medium severity. CVSS v3 base score is 6.8 out of 10.