CVE-2026-104002 AWS CVE debrief

Who should care

Defenders responsible for Powertools for AWS Lambda (Python) deployments should assess exposure and prioritize upgrading to version 3.35.0. This includes operators, platform administrators, vulnerability management teams, and security teams who need to ensure the security and integrity of sensitive data. The issue could lead to potential sensitive data exposure if not addressed promptly, making it essential for these teams to take proactive measures to rem

Why it matters

Defenders should prioritize upgrading to version 3.35.0 to prevent potential sensitive data exposure in Powertools for AWS Lambda (Python) deployments.

• Potential sensitive data exposure
• Need to verify and upgrade to version 3.35.0
• Possible impact on data confidentiality

Technical summary

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. This issue is related to the handling of errors in the data masking utility and could lead to potential sensitive data exposure. The utility is designed to protect sensitive information, but the fail-open error handling issue could allow unauthorized access to this information. The issue can be remediated by upgrading to version 3.35.0.

Defensive priority

Defenders should prioritize upgrading to version 3.35.0 to prevent potential sensitive data exposure.

Recommended defensive actions

• Upgrade to version 3.35.0
• Review and update affected systems
• Monitor for potential sensitive data exposure
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The CVE record and source item provide details on the fail-open error handling issue in Powertools for AWS Lambda (Python). The issue is related to the data masking utility and could lead to sensitive data exposure. The CVE record was published on 2026-10-01T21:05:55.109Z and has not been modified since then. The source item provides additional context on the issue, but the details are limited. Further verification is needed to confirm the affected scope and severity.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.