Vulnerability · Published Oct 1, 2026 · Assigned by AMZN
CVE-2026-104002Fail-open error handling in the data masking utility in Powertools for AWS Lambda (Python)
Medium 5.3
In plain English
A medium-severity security flaw in powertools-lambda-python from AWS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities).
Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.3%top 76.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| AWS | powertools-lambda-python | 3.6.0 – through 3.34.0 |
Weakness: CWE-390 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N