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.

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 positio…

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)

CWE-322 — Key Exchange without Entity Authentication

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.