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TI-2026-07554 Aliases CVE-2026-8596GHSA-7hh5-prp2-mfh5

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

Priority MEDIUM 40CWE-312Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-312.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00607 49th percentileScored 2026-11-07
Fix Fixed sagemaker (PyPI): 2.257.2, 3.8.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
AWSAmazon SageMaker Python SDK2.199.0 – 2.257.1; 3.0.0 – 3.7.1—No fix listedCNA
—sagemaker (PyPI)2.199.0 to before 2.257.22.257.2Patch availableGHSA-7hh5-prp2-mfh5
—sagemaker (PyPI)3.0.0 to before 3.8.03.8.0Patch availableGHSA-7hh5-prp2-mfh5
  • Amazon SageMaker Python SDK VendorAWS Affected 2.199.0 – 2.257.1; 3.0.0 – 3.7.1 Fixed in — No fix listed CNA
  • sagemaker (PyPI) Vendor— Affected 2.199.0 to before 2.257.2 Fixed in 2.257.2 Patch available GHSA-7hh5-prp2-mfh5
  • sagemaker (PyPI) Vendor— Affected 3.0.0 to before 3.8.0 Fixed in 3.8.0 Patch available GHSA-7hh5-prp2-mfh5

Remediation

  • Fix · GHSA-7hh5-prp2-mfh5 sagemaker (PyPI) Fixed in 2.257.2 Advisory →
  • Fix · GHSA-7hh5-prp2-mfh5 sagemaker (PyPI) Fixed in 3.8.0 Advisory →

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    AWS Amazon SageMaker Python SDK — aws.amazon.com/security/security-bulletins/2026-031-aws

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-07555 Missing integrity verification in Triton inference handler in Amazon SageMaker Python SDKPriority LOW 31
    Show all 2 records → Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-8596
  2. 2026-10-03 Alias added: GHSA-7hh5-prp2-mfh5
  3. 2026-10-20 Affected versions changed · CNA
  4. 2026-10-25 EPSS moved to the below the 50th percentile

References

Patch 2

Advisory 3

Other 2

  • TI-2026-23989 crypto: algif_aead - Revert to operating out-of-place KEVCVSS 3.1HIGH 7.8
  • TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
  • TI-2024-18648 Amazon AWS Amplify CLI before 12.10.1 incorrectly configures the role trust policy of IAM… CVSS 3.1CRITICAL 9.8
  • TI-2024-05929 Openssh: regresshion - race condition in ssh allows rce/dos CVSS 3.1HIGH 8.1
  • TI-2025-03847 Input validation issue in AWS Amplify Studio UI component properties CVSS 4.0CRITICAL 9.0
  • TI-2026-11603 HTTP/2 Stream Parser Confusion Body-Inspection Bypass in Amazon CloudFront with AWS WAF CVSS 4.0HIGH 7.9
See all 383 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences