MongoDB C# Driver up to 3.12.x BSON Deserialization information disclosure

Summaryinfo

A vulnerability marked as problematic has been reported in MongoDB C# Driver up to 3.12.x. This vulnerability affects unknown code of the component BSON Deserialization. Performing a manipulation results in information disclosure. This vulnerability was named CVE-2026-114651. The attack may be initiated remotely. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in MongoDB C# Driver up to 3.12.x. It has been classified as problematic. This affects an unknown code of the component BSON Deserialization. The manipulation with an unknown input leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality. The summary by CVE is:

A memory-handling weakness in the BSON deserialization component of the MongoDB C# Driver may cause data left over from previously processed content to be returned when specially crafted serialized input is parsed. An unauthenticated party able to supply serialized data to an application that maps certain primitive collection types can cause residual bytes from unrelated data processed earlier on the same execution thread to be surfaced as legitimate values. This can result in disclosure of a limited amount of information belonging to other requests or principals of the consuming application. No authentication or special privileges within the application are required.

The advisory is shared at jira.mongodb.org. This vulnerability is uniquely identified as CVE-2026-114651 since 10/21/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

Upgrading to version 3.13.0 eliminates this vulnerability.

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Productinfo

Type

• Database Software

Vendor

• MongoDB

Name

• C# Driver

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6
• 3.7
• 3.8
• 3.9
• 3.10
• 3.11
• 3.12

License

• open-source

CPE 2.3info

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CPE 2.2info

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