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Vulnerabilities

Vulnerability · CVE-2026-112408

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

Published Oct 21, 2026 · catalog updated Oct 21, 2026 · Amazon Web Services

Last checked Nov 6, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-112408. EPSS is 0.74%. Act only if a listed version of Amazon Web Services is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.4
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.74%
Remediation
Advisory link
Affected products
Amazon Web Services

Bulletin ID: 2026-142-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 10/21/2026 12:30 PM PDT Description: The Amazon SageMaker Python SDK is an open-source library for training and deploying machine learning models on Amazon SageMaker. We identified CVE-2026-112408, an issue in the default_bucket() function. The SDK uses a predictably named Amazon S3 bucket and does not check that the caller's AWS account owns it. A remote actor who creates that bucket first could achieve code execution in a remote S

No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.

How to fix CVE-2026-112408

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-112408. EPSS is 0.74%. Act only if a listed version of Amazon Web Services is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-940. EPSS 0.74%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 21, 2026 · NIST NVD

    Detected

    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 thi

Sources

  • AWS Security BulletinsVendor advisoryCVE-2026-112408

    Bulletin ID: 2026-142-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 10/21/2026 12:30 PM PDT Description: The Amazon SageMaker Python SDK is an open-source library for training and deploying machine learning models on Amazon SageMaker. We identified

    aws.amazon.com
  • CVE.orgVulnerability recordCVE-2026-112408

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-112408

    30-day exploitation probability 0.74%

    first.org
  • NIST NVDVulnerability recordCVE-2026-112408

    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 creden

    nvd.nist.gov

References

Freshness

Last verified in this catalog Nov 6, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 6, 2026
  • AWS Security BulletinsOct 28, 2026
  • CVE.orgOct 22, 2026
  • NIST NVDOct 22, 2026