What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-21 · updated 2026-10-30
• Weakness: 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 products

• AWS SageMaker Python SDK: before 2.257.3; from 3.0.0 before 3.10.0 — fixed in 2.257.3, 3.10.0

How to fix

Upgrade to a fixed version: AWS SageMaker Python SDK 2.257.3, 3.10.0. Check the vendor advisory for mitigations.

References

• 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/v3.10.0
• 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/3.10.0/

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