CVE-2026-112408 Missing bucket ownership verification in Amazon SageMaker Python SDK default_bucket()
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-112408?
CVE-2026-112408 is a critical vulnerability in AWS Amazon SageMaker Python SDK, published on 21 Oct 2026.
Official 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).
Weakness: CWE-940
Which versions are affected by CVE-2026-112408?
How do I fix CVE-2026-112408?
No fix has been published for CVE-2026-112408 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-112408 being exploited?
There is no known exploitation of CVE-2026-112408 in the wild and no public exploit code.
Sources
Also known as GHSA-5rx8-8fr2-f855.