CVE-2026-104002 Fail-open error handling in the data masking utility in Powertools for AWS Lambda (Python)
Attackers can read sensitive data intended to be masked due to fail-open error handling in the AWS Lambda Powertools data masking utility.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-104002?
CVE-2026-104002 is a medium-severity vulnerability in AWS powertools-lambda-python, published on 1 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
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.
Weakness: CWE-390
Which versions are affected by CVE-2026-104002?
How do I fix CVE-2026-104002?
No fix has been published for CVE-2026-104002 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-104002 being exploited?
There is no known exploitation of CVE-2026-104002 in the wild and no public exploit code.
Sources
Also known as GHSA-3vxg-4xv2-jfh5.