Cleartext storage of HMAC signing key in Amazon SageMaker Python SDK ModelBuilder/Serve path
Published May 14, 2026
8.5
HIGHCVSS 4.0
EPSS 0.80%
Description
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
-
- Version 2.199.0StatusaffectedConstraints<=2.257.1
- Version 3.0.0StatusaffectedConstraints<=3.7.1
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Amazon SageMaker Python SDK | AWS | unaffected |
|
No data.
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
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
1 other source (NVD) ▾
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
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
TotalDecision
n/aAssessed May 15, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
Score over time
May–Oct 2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (3 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 0.80% (0.00802) | 55.09th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.44% (0.00439) | 34.79th | v5 (v2026.06.15) |
| May 15, 2026 | 0.17% (0.00165) | 37.18th | v4 (v2025.03.14) |
References (6)
- https://aws.amazon.com/security/security-bulletins/2026-031-aws vendor-advisory
- https://github.com/advisories/GHSA-7hh5-prp2-mfh5 Advisory
- 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://github.com/aws/sagemaker-python-sdk/security/advisories/GHSA-7hh5-prp2-mfh5 third-party-advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-8596
Change history (0)
No recorded changes yet.