CVE-2026-112408

High

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).

SeverityHigh

CVSS8.1

Exploit probability—

ProductAmazon SageMaker Python SDK

PublishedOct 21, 2026

First seenOct 21, 2026

Weakness typeCWE-940CWE-940

How to fix

Update

AWS Amazon SageMaker Python SDK2.257.3, 3.10.0 or later

Patches

Vendor advisories

aws.amazon.com/security/security-bulletins/2026-142-aws/

Affected products

Product	Affected versions	Fixed in
AWS Amazon SageMaker Python SDK	v < 2.257.3, 3.0.0 ≤ v < 3.10.0	2.257.3, 3.10.0

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