High 8.1Published Oct 21, 2026

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

Updated under an hour ago (2026-10-22 10:00 UTC)

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It affects AWS Amazon SageMaker Python SDK. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for AWS Amazon SageMaker Python SDK

Exploited in the last 30 days

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).

CVSS: 8.1 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-940
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: AMZN
NVD analysis: Received
Record last updated: Oct 21, 2026
First seen by InfoSec Signals: Oct 21, 2026

Affected products

Affected products

AWS Amazon SageMaker Python SDK aws:amazon_sagemaker_python_sdk (from the name)	before 2.257.3; from 3.0.0 before 3.10.0	CNA record

References

https://github.com/aws/sagemaker-python-sdk/releases/tag/v2.257.3release-notes, patch
https://github.com/aws/sagemaker-python-sdk/releases/tag/v3.10.0release-notes, patch
https://pypi.org/project/sagemaker/3.10.0/release-notes, patch
https://pypi.org/project/sagemaker/2.257.3/release-notes, patch
https://aws.amazon.com/security/security-bulletins/2026-142-aws/vendor-advisory
https://github.com/aws/sagemaker-python-sdk/security/advisories/GHSA-5rx8-8fr2-f855third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.