Vulnerability Description
A numeric-type conversion flaw in the BSON handling library of the MongoDB C# Driver allows an out-of-range binary subtype value supplied through untrusted textual input to bypass the library's binary-element integrity checks. When such a value is later encoded, it is narrowed to a smaller wire representation, producing binary elements that misdeclare their type or length. An unauthenticated party able to supply text parsed by an affected application can cause it to emit and persist malformed binary data, which subsequent readers either reject with an error or silently interpret as shorter than the data that was validated.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/mongodb/mongo-csharp-driver/releases/tag/v3.13.0
- https://github.com/mongodb/mongo-csharp-driver/security/advisories/GHSA-5h2q-6c9
- https://jira.mongodb.org/browse/CSHARP-6166
- https://github.com/mongodb/mongo-csharp-driver/security/advisories/GHSA-5h2q-6c9
FAQ
What is CVE-2026-114654?
CVE-2026-114654 is a vulnerability with a CVSS score of 6.5 (MEDIUM). A numeric-type conversion flaw in the BSON handling library of the MongoDB C# Driver allows an out-of-range binary subtype value supplied through untrusted textual input to bypass the library's binary...
How severe is CVE-2026-114654?
CVE-2026-114654 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-114654?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.