CVE-2026-114650: A flaw in the client-side encryption support of the MongoDB .NET/C# driver can cause data designated for client-side field-level encryption to be written…

PriorityP429medium5.9CVSS 3.1

AVLACHPRNUINSCCHINAN

EPSS

0.11%

1.1th percentile

no history available

A flaw in the client-side encryption support of the MongoDB .NET/C# driver can cause data designated for client-side field-level encryption to be written without encryption. Under certain platform text-encoding configurations, an internal name conversion loses information, so the encryption layer fails to associate the operation with its configured encryption rules and the operation proceeds without an error being raised. An application user with the ability to write data through an affected application can therefore have sensitive fields persisted in plaintext, defeating the confidentiality guarantee that client-side encryption is intended to provide. No integrity or availability impact was observed.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
mongodb	c_driver	>= 2.10.0 < 3.13.0	3.13.0
mongodb	mongodb.libmongocrypt_nuget_package	1.0.0 – 1.12.0	—

CVSS provenance

nvdv3.15.9MEDIUMCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

nvdv4.06.9MEDIUMCVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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