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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| AWS | aws-cli | ≤ 1.45.27, ≤ 2.35.2 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | awscli-2 | 2.36.47-4.amzn2023.0.1 | ALAS2023-2026-3133 |
| Amazon Linux 2 | awscli | 1.18.147-1.amzn2.0.4 | ALAS2-2026-3966 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | awscli | < 1.45.28 | 1.45.28 | GHSA-hqvf-45jj-mccq |
Advisories 2
- ALAS2023-2026-3133 Moderate: awscli-2 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Nov 5, 2026
- ALAS2-2026-3966 Moderate: awscli security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Oct 12, 2026
References
- https://github.com/aws/aws-cli/blob/develop/CHANGELOG.rst patch release-notes
- https://github.com/aws/aws-cli/blob/v2/CHANGELOG.rst patch release-notes
- https://aws.amazon.com/security/security-bulletins/2026-071-aws/ vendor-advisory
- https://github.com/aws/aws-cli/security/advisories/GHSA-hqvf-45jj-mccq release-notes