CVE WatchOct 22, 2026

CVE-2026-114646

A data-validation flaw exists in the BSON handling and binary serialization path of the MongoDB C# Driver. When an application constructs a

CVSS

6.5

Medium

EPSS

0.3%

p17

KEV

—

Exploit Today

0-100

Published: Oct 22, 2026 · Last modified: Oct 22, 2026 · CWE-130

EPSS · 30d

Not enough EPSS history yet.

Technical description

A data-validation flaw exists in the BSON handling and binary serialization path of the MongoDB C# Driver. When an application constructs a raw or lazy BSON document object from externally supplied binary data, the driver does not verify that the size quantity declared inside that data matches the amount of data actually provided, and it copies the data onto the wire unchanged. An unauthenticated party who can supply binary content to such an application can thereby cause additional elements to be inserted into, or existing elements to be removed from, the database command the application issues, without needing any database credentials of their own. This can result in unauthorized modification of stored data and disclosure of data outside the intended scope of the application's request, bounded by the database privileges the application itself holds.

Official references

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