Amazon Linux 2 (EOS) Security Advisory: ALAS2-2026-3966
Advisory Released Date: 2026-10-12
Advisory Updated Date: 2026-10-12
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. (CVE-2026-13769)
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-2026-18654)
Affected Packages:
awscli
Note:
This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update awscli or yum update --advisory ALAS2-2026-3966 to update your system.
noarch:
awscli-1.18.147-1.amzn2.0.4.noarch
src:
awscli-1.18.147-1.amzn2.0.4.src