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CVE PROGRAM SOURCE RECORD6.3 Medium

CVE-2026-114651

Cross-document data leak via malformed BSON array parsing in reused thread buffer

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

MongoDB C# Driver

Default version status: unaffected

  • 2.26.0 to < 3.13.0affected

References