CVE-2026-104002

Medium

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.

SeverityMedium

CVSS5.3

Exploit probability—

ProductAws Powertools-lambda-python

PublishedOct 1, 2026

First seenOct 1, 2026

Weakness typeCWE-390CWE-390

How to fix

Patches

github.com/aws-powertools/powertools-lambda-python/releases/tag/v3.35.0

Vendor advisories

aws.amazon.com/security/security-bulletins/2026-123-aws/

Affected products

Product	Affected versions	Fixed in
AWS powertools-lambda-python	3.6.0 ≤ v ≤ 3.34.0	—

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