What is CVE-2026-104002?

CVE-2026-104002 is a medium-severity vulnerability in AWS Powertools-Lambda-Python, classified under CWE-390. CVSS score: 5.3/10. Published 2026-10-01.

How severe is CVE-2026-104002?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in AWS Powertools-Lambda-Python

CVE-2026-104002

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.

Published 2026-10-01 · last modified 2026-10-02.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

AWS Powertools-Lambda-Python

Weakness classification (CWE)

CWE-390

References

ff89ba41-3aa1-4d27-914a-91399e9639e5 (patch)
ff89ba41-3aa1-4d27-914a-91399e9639e5 (vendor-advisory)
ff89ba41-3aa1-4d27-914a-91399e9639e5 (third-party-advisory)

Frequently asked questions

What is CVE-2026-104002?: CVE-2026-104002 is a medium-severity vulnerability in AWS Powertools-Lambda-Python, classified under CWE-390. CVSS score: 5.3/10. Published 2026-10-01.
How severe is CVE-2026-104002?: Medium severity. CVSS v3 base score is 5.3 out of 10.