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Vulnerability Details :

CVE-2026-8596

Summary
Assigner-AMZN
Assigner Org ID-ff89ba41-3aa1-4d27-914a-91399e9639e5
Published At-14 May, 2026 | 19:35
Updated At-16 May, 2026 | 03:56
Rejected At-
Credits

Cleartext storage of HMAC signing key in Amazon SageMaker Python SDK ModelBuilder/Serve path

Cleartext storage of sensitive information in the ModelBuilder/Serve component in Amazon SageMaker Python SDK before v2.257.2 and v3 before v3.8.0 might allow a remote authenticated actor to extract the HMAC signing key from SageMaker API responses and forge valid integrity signatures for specially crafted model artifacts, achieving code execution in inference containers. This issue requires a remote authenticated actor with permissions to call SageMaker describe APIs and S3 write access to the model artifact path. To remediate this issue, we recommend upgrading to Amazon SageMaker Python SDK v2.257.2 or v3.8.0 and rebuild any models previously created with ModelBuilder using the updated SDK.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
â–¼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:AMZN
Assigner Org ID:ff89ba41-3aa1-4d27-914a-91399e9639e5
Published At:14 May, 2026 | 19:35
Updated At:16 May, 2026 | 03:56
Rejected At:
â–¼CVE Numbering Authority (CNA)
Cleartext storage of HMAC signing key in Amazon SageMaker Python SDK ModelBuilder/Serve path

Cleartext storage of sensitive information in the ModelBuilder/Serve component in Amazon SageMaker Python SDK before v2.257.2 and v3 before v3.8.0 might allow a remote authenticated actor to extract the HMAC signing key from SageMaker API responses and forge valid integrity signatures for specially crafted model artifacts, achieving code execution in inference containers. This issue requires a remote authenticated actor with permissions to call SageMaker describe APIs and S3 write access to the model artifact path. To remediate this issue, we recommend upgrading to Amazon SageMaker Python SDK v2.257.2 or v3.8.0 and rebuild any models previously created with ModelBuilder using the updated SDK.

Affected Products
Vendor
Amazon SageMaker Python SDK
Product
AWS
Default Status
unaffected
Versions
Affected
  • From 2.199.0 through 2.257.1 (custom)
  • From 3.0.0 through 3.7.1 (custom)
Problem Types
TypeCWE IDDescription
CWECWE-312CWE-312 Cleartext storage of sensitive information
Type: CWE
CWE ID: CWE-312
Description: CWE-312 Cleartext storage of sensitive information
Metrics
VersionBase scoreBase severityVector
3.17.2HIGH
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
4.08.5HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:H/SI:H/SA:H
Version: 3.1
Base score: 7.2
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Version: 4.0
Base score: 8.5
Base severity: HIGH
Vector:
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:H/SI:H/SA:H
Metrics Other Info
Impacts
CAPEC IDDescription
CAPEC-586CAPEC-586 Object Injection
CAPEC ID: CAPEC-586
Description: CAPEC-586 Object Injection
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/aws/sagemaker-python-sdk/releases/tag/v2.257.2
patch
https://github.com/aws/sagemaker-python-sdk/releases/tag/v3.8.0
patch
https://aws.amazon.com/security/security-bulletins/2026-031-aws/
vendor-advisory
https://github.com/aws/sagemaker-python-sdk/security/advisories/GHSA-7hh5-prp2-mfh5
third-party-advisory
Hyperlink: https://github.com/aws/sagemaker-python-sdk/releases/tag/v2.257.2
Resource:
patch
Hyperlink: https://github.com/aws/sagemaker-python-sdk/releases/tag/v3.8.0
Resource:
patch
Hyperlink: https://aws.amazon.com/security/security-bulletins/2026-031-aws/
Resource:
vendor-advisory
Hyperlink: https://github.com/aws/sagemaker-python-sdk/security/advisories/GHSA-7hh5-prp2-mfh5
Resource:
third-party-advisory
â–¼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
Information is not available yet
â–¼National Vulnerability Database (NVD)
nvd.nist.gov
Source:ff89ba41-3aa1-4d27-914a-91399e9639e5
Published At:14 May, 2026 | 20:17
Updated At:15 May, 2026 | 14:10

Cleartext storage of sensitive information in the ModelBuilder/Serve component in Amazon SageMaker Python SDK before v2.257.2 and v3 before v3.8.0 might allow a remote authenticated actor to extract the HMAC signing key from SageMaker API responses and forge valid integrity signatures for specially crafted model artifacts, achieving code execution in inference containers. This issue requires a remote authenticated actor with permissions to call SageMaker describe APIs and S3 write access to the model artifact path. To remediate this issue, we recommend upgrading to Amazon SageMaker Python SDK v2.257.2 or v3.8.0 and rebuild any models previously created with ModelBuilder using the updated SDK.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.08.5HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Secondary3.17.2HIGH
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Type: Secondary
Version: 4.0
Base score: 8.5
Base severity: HIGH
Vector:
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Type: Secondary
Version: 3.1
Base score: 7.2
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CPE Matches

Weaknesses
CWE IDTypeSource
CWE-312Secondaryff89ba41-3aa1-4d27-914a-91399e9639e5
CWE ID: CWE-312
Type: Secondary
Source: ff89ba41-3aa1-4d27-914a-91399e9639e5
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://aws.amazon.com/security/security-bulletins/2026-031-aws/ff89ba41-3aa1-4d27-914a-91399e9639e5
N/A
https://github.com/aws/sagemaker-python-sdk/releases/tag/v2.257.2ff89ba41-3aa1-4d27-914a-91399e9639e5
N/A
https://github.com/aws/sagemaker-python-sdk/releases/tag/v3.8.0ff89ba41-3aa1-4d27-914a-91399e9639e5
N/A
https://github.com/aws/sagemaker-python-sdk/security/advisories/GHSA-7hh5-prp2-mfh5ff89ba41-3aa1-4d27-914a-91399e9639e5
N/A
Hyperlink: https://aws.amazon.com/security/security-bulletins/2026-031-aws/
Source: ff89ba41-3aa1-4d27-914a-91399e9639e5
Resource: N/A
Hyperlink: https://github.com/aws/sagemaker-python-sdk/releases/tag/v2.257.2
Source: ff89ba41-3aa1-4d27-914a-91399e9639e5
Resource: N/A
Hyperlink: https://github.com/aws/sagemaker-python-sdk/releases/tag/v3.8.0
Source: ff89ba41-3aa1-4d27-914a-91399e9639e5
Resource: N/A
Hyperlink: https://github.com/aws/sagemaker-python-sdk/security/advisories/GHSA-7hh5-prp2-mfh5
Source: ff89ba41-3aa1-4d27-914a-91399e9639e5
Resource: N/A

Change History

0
Information is not available yet

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Cleartext Storage of Sensitive Information
Details not found