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Vulnerabilities

Vulnerability · CVE-2026-104002

CVE-2026-104002: Fail-open error handling in the data masking utility in Powertools for AWS Lambda (Python)

Published Oct 1, 2026 · Amazon Web Services

Check if you run it

No confirmed exploitation is on record for CVE-2026-104002. EPSS is 0.31%. Act only if a listed version of Amazon Web Services is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Unknown—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.31%
Remediation
Not established
Affected products
Amazon Web Services

Bulletin ID: 2026-123-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 10/01/2026 14:00 PM PDT Description: Powertools for AWS Lambda (Python) is a developer toolkit that implements serverless best practices and increases developer velocity. We identified CVE-2026-104002, a fail-open error handling issue within the data masking utility of Powertools for AWS Lambda (Python). This issue might allow actors to read sensitive field values that the application intended to mask. Impacted versions:</

No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.

How to fix CVE-2026-104002

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-104002. EPSS is 0.31%. Act only if a listed version of Amazon Web Services is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.31%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 1, 2026 · AWS Security Bulletins

    Detected

    Bulletin ID: 2026-123-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 10/01/2026 14:00 PM PDT Description: Powertools for AWS Lambda (Python) is a developer toolkit that implements serverless best practices and increases developer velocity. We identified CVE-2026-104002, a fail-open error handling issue within the data masking utility of Powertools for AWS Lambda (Pyt

Sources

  • AWS Security BulletinsVendor advisoryCVE-2026-104002

    Bulletin ID: 2026-123-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 10/01/2026 14:00 PM PDT Description: Powertools for AWS Lambda (Python) is a developer toolkit that implements serverless best practices and increases developer velocity. We identi

    aws.amazon.com
  • CVE.orgVulnerability recordCVE-2026-104002

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-104002

    30-day exploitation probability 0.31%

    first.org

Freshness

Last verified in this catalog Oct 23, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.