CVE-2026-81530KMS master key exposure via unredacted credential serialization in driver settings string
Updated under an hour ago ()
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It affects MongoDB C# Driver and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 5.6 MEDIUM (v3.1, CNA)CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
- Weakness (CWE)
- CWE-532
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- mongodb
- NVD analysis
- Analyzed
- Record last updated
- Aug 28, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
MongoDB C# Driver mongodb:c_driver (from the name) | from 2.10.0 before 3.11.1 | CNA record |
mongodb c#_driver mongodb:c#_driver | from 2.10.0 before 3.11.1 | NVD |
References
- https://jira.mongodb.org/browse/CSHARP-6164vendor-advisory
- https://www.nuget.org/packages/MongoDB.Driver/3.11.1product
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.