Medium 5.3Published Oct 1, 2026

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

Updated under an hour ago (2026-10-19 07:23 UTC)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for AWS powertools-lambda-python

Exploited in the last 30 days

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.

CVSS: 5.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness (CWE): CWE-390
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: AMZN
NVD analysis: Awaiting Analysis
Record last updated: Oct 9, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

AWS powertools-lambda-python aws:powertools_lambda_python (from the name)	from 3.6.0 through 3.34.0	CNA record

References

https://github.com/aws-powertools/powertools-lambda-python/releases/tag/v3.35.0patch
https://aws.amazon.com/security/security-bulletins/2026-123-aws/vendor-advisory
https://github.com/aws-powertools/powertools-lambda-python/security/advisories/GHSA-3vxg-4xv2-jfh5third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.