PatchTheCEVCVE-2026-114651: A memory-handling weakness in the BSON deserialization component of the MongoDB C# Driver may cause data left
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Routine
MEDIUM 4.0REMOTE
CVE-2026-114651 is a medium-severity flaw (CVSS 4.0) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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 legiti
Why this priority
- Remotely exploitable, no login, no user action
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 4.0 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | High |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.4% (top 68%) |
| CISA exploited list | No |
| Weakness | CWE-908 |
| Published | 2026-10-22 |
| Last modified | 2026-10-23 |
Publisher (CNA): MongoDB, Inc.
Timeline
- Published CVE record published
- Updated Record last modified
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.