CVE-2026-81530

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Client-Side Encryption Credential Exposure in MongoDB C# Driver

Publication date: 2026-08-27

Last updated on: 2026-08-28

Assigner: MongoDB, Inc.

Description

A weakness in the client-side encryption configuration surface of the MongoDB C# Driver causes sensitive key-management credential material supplied by the application to be reproduced verbatim in the driver's human-readable diagnostic representation of its client settings, instead of being masked as other secret fields are. A party able to read the application's logs, diagnostic output, or a process memory dump may thereby recover the plaintext credentials and use them to decrypt protected field data.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-08-27

Last Modified

2026-08-28

Generated

2026-09-17

AI Q&A

2026-08-28

EPSS Evaluated

2026-09-15

NVD

CVE-2026-81530

Affected Vendors & Products

Vendor	Product	Version / Range
mongodb	mongodb_csharp_driver	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-532	The product writes sensitive information to a log file.

Attack-Flow Graph

Executive Summary

This vulnerability involves the MongoDB C# Driver exposing sensitive key-management credentials in its diagnostic output. Instead of masking these credentials like other secret fields, they are reproduced in plaintext. An attacker with access to logs, diagnostic output, or memory dumps could recover these credentials and use them to decrypt protected data.

Detection Guidance

This vulnerability involves sensitive credentials being exposed in logs or diagnostic output. To detect it, inspect application logs and diagnostic output for plaintext credentials in the MongoDB C# Driver settings. Check for any logs containing client-side encryption configuration details or process memory dumps that might reveal credentials.

Impact Analysis

If you use the MongoDB C# Driver, an attacker who gains access to your application's logs, diagnostic output, or memory dumps could recover plaintext credentials. This could lead to unauthorized decryption of sensitive data, potentially exposing confidential information such as user data or business secrets.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating requirements for data protection and confidentiality under GDPR and HIPAA. Non-compliance may result in legal penalties, fines, or reputational damage due to exposed personal or health information.

Mitigation Strategies

Review MongoDB C# Driver logs and diagnostic outputs for exposed sensitive credentials. Avoid storing plaintext credentials in logs or memory dumps. Update to a patched version of the MongoDB C# Driver if available.

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