CVE-2026-114646 NoSQL command injection via mismatched raw BSON length prefix written verbatim to the wire
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-114646?
CVE-2026-114646 is a medium-severity vulnerability in MongoDB C# Driver, published on 22 Oct 2026.
Official 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.
Weakness: CWE-130
Which versions are affected by CVE-2026-114646?
How do I fix CVE-2026-114646?
No fix has been published for CVE-2026-114646 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-114646 being exploited?
There is no known exploitation of CVE-2026-114646 in the wild and no public exploit code.
Sources
Also known as GHSA-5chr-phc4-wcj2.