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CVE-2026-8596— Cleartext storage of HMAC signing key in Amazon SageMaker Python SDK ModelBuilder/Serve path

Quick assessment

Affected
AWS Amazon SageMaker Python SDK
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Amazon SageMaker Python SDK是美国亚马逊（Amazon）公司的一个构件、训练和部署机器学习模型的开发者工具包。 Amazon SageMaker Python SDK v2.257.2之前版本和v3.8.0之前版本存在安全漏洞，该漏洞源于ModelBuilder/Serve组件明文存储敏感信息，可能导致远程认证攻击者从SageMaker API响应中提取HMAC签名密钥并伪造有效完整性签名，实现推理容器中的代码执行。

CVSS 7.2 · High EPSS 0.80% · P56

Affected Version Matrix 2

VendorProduct Version RangeStatus
AWS Amazon SageMaker Python SDK 2.199.0≤ 2.257.1 affected
3.0.0≤ 3.7.1 affected
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I. Basic Information for CVE-2026-8596

Vulnerability Information
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Vulnerability Title
Cleartext storage of HMAC signing key in Amazon SageMaker Python SDK ModelBuilder/Serve path
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
敏感数据的明文存储
Source: CVE Program / CVE List V5
Vulnerability Title
Amazon SageMaker Python SDK 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Amazon SageMaker Python SDK是美国亚马逊（Amazon）公司的一个构件、训练和部署机器学习模型的开发者工具包。 Amazon SageMaker Python SDK v2.257.2之前版本和v3.8.0之前版本存在安全漏洞，该漏洞源于ModelBuilder/Serve组件明文存储敏感信息，可能导致远程认证攻击者从SageMaker API响应中提取HMAC签名密钥并伪造有效完整性签名，实现推理容器中的代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
AWS Amazon SageMaker Python SDK 2.199.0 ~ 2.257.1 -

II. Public POCs for CVE-2026-8596

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8005 chars
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III. Intelligence Information for CVE-2026-8596

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Vendor Advisories for CVE-2026-8596 (2)

Vendor Pages for CVE-2026-8596 (2)

IV. Related Vulnerabilities

Same product: Amazon SageMaker Python SDK
Same vendor: AWS
Same weakness: CWE-312

V. Comments for CVE-2026-8596

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