CVE-2026-81530 KMS master key exposure via unredacted credential serialization in driver settings string

What is CVE-2026-81530?

CVE-2026-81530 is a medium-severity vulnerability in MongoDB C# Driver, published on 27 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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.

Weakness: CWE-532

Which versions are affected by CVE-2026-81530?

It affects 1 product.

Products include Mongodb C\# Driver.

How do I fix CVE-2026-81530?

No fix has been published for CVE-2026-81530 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-81530 being exploited?

There is no known exploitation of CVE-2026-81530 in the wild and no public exploit code.

Other vulnerabilities in MongoDB C# Driver

• CVE-2026-88026 Regular expression injection via unescaped characters in LINQ query translation in MongoDB C# Driver High 7.1
• CVE-2026-81529 Connection-option injection via unescaped settings in the canonical MongoDB URL builder High 7.1
• CVE-2026-81527 NoSQL injection via unquoted constant GroupBy keys in LINQ pipeline translation Medium 6.9
• CVE-2022-48282 Deserializing compromised object with MongoDB .NET/C# Driver may cause remote code execution Medium 6.6
• CVE-2026-88025 GridFS data disclosure and deletion via query-operator injection in file IDs in the MongoDB C# Driver Medium 6.1

Sources

• CVE record
• NVD
• OSV
• How this page is made