Medium severity · published Oct 1, 2026
CVE-2026-104002
Fail-open error handling in the data masking utility in Powertools for AWS Lambda (Python)
5.3
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 23% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PO
powertools-lambda-python · AWS
3.6.0 through 3.34.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-104002
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-104002
patch
https://github.com/aws-powertools/powertools-lambda-python/releases/tag/v3.35.0
vendor-advisory
https://aws.amazon.com/security/security-bulletins/2026-123-aws/
third-party-advisory
https://github.com/aws-powertools/powertools-lambda-python/security/advisories/GHSA-3vxg-4xv2-jfh5