Amazon Linux 2027 Preview Security Advisory: ALAS2027-2026-213
Advisory Release Date: 2026-10-26 09:00 Pacific
Advisory Updated Date: 2026-10-26 09:00 Pacific
Package updates are available for Amazon Linux 2027 that fix the following vulnerabilities:
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.
CVE-2026-13769:
Overly permissive file permissions in AWS CLI before 1.44.78 (v1) and 2.34.29 (v2) on Unix-like systems where the umask has not been configured to restrict file permissions (the default on most systems) may allow other local users on the same host to read credentials written by certain CLI subcommands (aws codeartifact login, aws iam create-virtual-mfa-device, aws deploy register).
To remediate this issue, users should upgrade to AWS CLI 1.44.78 (v1) or 2.34.29 (v2) or later.
Affected Packages:
awscli-2
Issue Correction:
Run dnf update awscli-2 --releasever 2027.0.20261026 or dnf update --advisory ALAS2027-2026-213 --releasever 2027.0.20261026 to update your system.
noarch:
awscli-2-2.36.47-1.amzn2027.0.2.noarch
src:
awscli-2-2.36.47-1.amzn2027.0.2.src