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CVE-2026-104002— Fail-open error handling in the data masking utility in Powertools for AWS Lambda (Python)

Quick assessment

Affected
AWS powertools-lambda-python
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

AWS Lambda Powertools（Python）中的数据处理实用程序存在一个“失败时开放”（fail-open）的错误处理问题，可能导致攻击者读取到应用程序原本打算进行掩码处理的敏感字段值。 为缓解此问题，用户应升级至 3.35.0 版本。

CVSS 5.3 · Medium EPSS 0.31% · P21

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System

Affected Version Matrix 1

VendorProduct Version RangeStatus
AWS powertools-lambda-python 3.6.0≤ 3.34.0 affected
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I. Basic Information for CVE-2026-104002

Vulnerability Information
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Vulnerability Title
Fail-open error handling in the data masking utility in Powertools for AWS Lambda (Python)
Source: CVE Program / CVE List V5
Vulnerability Description
A fail-open error handling issue within the data masking utility of Powertools for AWS Lambda (Python) might allow actors to read sensitive field values that the application intended to mask.  To remediate this issue, users should upgrade to version 3.35.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
未有动作错误条件的检测
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
AWS powertools-lambda-python 3.6.0 ~ 3.34.0 -

II. Public POCs for CVE-2026-104002

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III. Intelligence Information for CVE-2026-104002

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Vendor Advisories for CVE-2026-104002 (2)

Other References for CVE-2026-104002 (1)

Same Patch Batch · AWS · 2026-10-01 · 3 CVEs total

CVE-2026-97662 8.2 HIGH Argument injection in the diff scan operation in AWS security-agent-mcp-server allows arbi
CVE-2026-103505 6.5 MEDIUM AWS EFS CSI Driver Mount Option Injection via mounttargetipmap

IV. Related Vulnerabilities

Same vendor: AWS
Same weakness: CWE-390

V. Comments for CVE-2026-104002

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