CVE-2026-114651 Cross-document data leak via malformed BSON array parsing in reused thread buffer
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-114651?
CVE-2026-114651 is a medium-severity vulnerability in MongoDB C# Driver, published on 22 Oct 2026.
Official 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.
Weakness: CWE-908
Which versions are affected by CVE-2026-114651?
How do I fix CVE-2026-114651?
No fix has been published for CVE-2026-114651 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-114651 being exploited?
There is no known exploitation of CVE-2026-114651 in the wild and no public exploit code.
Sources
Also known as GHSA-f8xm-c88f-wq46.