# CVE-2026-112408: Missing bucket ownership verification in Amazon SageMaker Python SDK default_bucket()

> CVE-2026-112408: Missing bucket ownership verification in Amazon SageMaker Python SDK default_bucket(). CVSS 8.1 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-112408
Last updated: 2026-10-22T17:21:57Z

- Published: 2026-10-21 19:36 UTC · Updated: 2026-10-22 17:21 UTC · Assigner: AMZN
- CVSS: 8.1 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS: 0.74%, 54th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-940

## Description

Missing verification of source of a communication channel in the default\_bucket() function in Amazon SageMaker Python SDK V3 before 3.10.0 and V2 before 2.257.3 might allow remote actors to achieve code execution in the target SageMaker execution environment and obtain IAM credentials via pre-creation of a predictably named S3 bucket that the SDK uses without ownership validation. To remediate this issue, users should upgrade to Amazon SageMaker Python SDK 3.10.0 (V3) or 2.257.3 (V2).

## Affected vendors and products

- AWS: Amazon SageMaker Python SDK

## Tracked companies

- [Amazon Web Services](https://rewindex.com/company/aws.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-112408)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-112408)
- [https://aws.amazon.com/security/security-bulletins/2026-142-aws/](https://aws.amazon.com/security/security-bulletins/2026-142-aws/)
- [https://github.com/aws/sagemaker-python-sdk/releases/tag/v2.257.3](https://github.com/aws/sagemaker-python-sdk/releases/tag/v2.257.3)
- [https://github.com/aws/sagemaker-python-sdk/releases/tag/v3.10.0](https://github.com/aws/sagemaker-python-sdk/releases/tag/v3.10.0)
- [https://github.com/aws/sagemaker-python-sdk/security/advisories/GHSA-5rx8-8fr2-f855](https://github.com/aws/sagemaker-python-sdk/security/advisories/GHSA-5rx8-8fr2-f855)
- [https://pypi.org/project/sagemaker/2.257.3/](https://pypi.org/project/sagemaker/2.257.3/)
- [https://pypi.org/project/sagemaker/3.10.0/](https://pypi.org/project/sagemaker/3.10.0/)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-112408 · Markdown: https://rewindex.com/cve/CVE-2026-112408.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-112408 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:12:07.859Z