CVE-2022-48282: Deserializing compromised object with MongoDB .NET/C# Driver may cause remote code execution

Severity: high (CVSS 7.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-02-21 · updated 2026-06-17
Weakness: CWE-502

Description

Under very specific circumstances (see Required configuration section below), a privileged user is able to cause arbitrary code to be executed which may cause further disruption to services. This is specific to applications written in C#. This affects all MongoDB .NET/C# Driver versions prior to and including v2.18.0 Following configuration must be true for the vulnerability to be applicable: * Application must written in C# taking arbitrary data from users and serializing data using _t without any validation AND * Application must be running on a Windows host using the full .NET Framework, not .NET Core AND * Application must have domain model class with a property/field explicitly of type System.Object or a collection of type System.Object (against MongoDB best practice) AND * Malicious attacker must have unrestricted insert access to target database to add a _t discriminator."Following configuration must be true for the vulnerability to be applicable

Affected products

MongoDB Inc MongoDB .NET/C# Driver: before 2.19.0 — fixed in 2.19.0

How to fix

Upgrade to a fixed version: MongoDB Inc MongoDB .NET/C# Driver 2.19.0. Check the vendor advisory for mitigations.

References

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