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

> CVE-2026-104002: Fail-open error handling in the data masking utility in Powertools for AWS Lambda (Python). CVSS 5.3 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-104002
Last updated: 2026-10-09T16:32:36Z

- Published: 2026-10-01 21:05 UTC · Updated: 2026-10-09 16:32 UTC · Assigner: AMZN
- CVSS: 5.3 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
- EPSS: 0.31%, 23th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-390

## 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.

## Affected vendors and products

- AWS: powertools-lambda-python

## Tracked companies

- [Amazon Web Services](https://rewindex.com/company/aws.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-104002)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-104002)
- [https://aws.amazon.com/security/security-bulletins/2026-123-aws/](https://aws.amazon.com/security/security-bulletins/2026-123-aws/)
- [https://github.com/aws-powertools/powertools-lambda-python/releases/tag/v3.35.0](https://github.com/aws-powertools/powertools-lambda-python/releases/tag/v3.35.0)
- [https://github.com/aws-powertools/powertools-lambda-python/security/advisories/GHSA-3vxg-4xv2-jfh5](https://github.com/aws-powertools/powertools-lambda-python/security/advisories/GHSA-3vxg-4xv2-jfh5)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-104002 · Markdown: https://rewindex.com/cve/CVE-2026-104002.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-104002 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:16:54.057Z