Bulletin ID: 2026-174-AWS
Scope: AWS
Content Type: Important (requires attention)
Publication Date: 11/09/2026 13:00 PM PST

Description:

AWS ParallelCluster CLI is an open source command line tool, distributed on PyPI as aws-parallelcluster, that customers use to create and manage HPC clusters on AWS.

We identified CVE-2026-124033, an issue where the export-cluster-logs and export-image-logs commands in the AWS ParallelCluster CLI before version 3.16.0 contain a relative path traversal issue. An authenticated remote user with write access to the log export Amazon S3 bucket could use a crafted S3 object key to write files outside the intended export directory on the machine running the command. The written files would have names and content controlled by a third party, and would be created with the privileges of the user running the command.

Impacted versions: >= 3.0.0 AND < 3.16.0

Resolution:

This issue has been addressed in aws-parallelcluster version 3.16.0. We recommend upgrading to the latest version and ensuring any forked or derivative code is patched to incorporate the new fixes

Workarounds:

Ensure the Amazon S3 bucket used for log export is accessible by only trusted users.

References:

• CVE-2026-124033
• GHSA-h79v-mp93-644r

Acknowledgement:

We would like to thank Mohamed Abdelaal (0xmrma) for collaborating on this issue through the coordinated vulnerability disclosure process.

Please email aws-security@amazon.com with any security questions or concerns.