CVE-2026-114649GHSA-6gjm-424r-3jh2
C# Driver: Authentication bypass via issuer-and-serial-only certificate equality in shared cluster cache
MongoDB C# DriverDatabasesCVSS
7.6HighExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.20%Chance of exploitation activity in the next 30 days, higher than 9% of CVEs. Scored 23 Oct 2026FIRST EPSS
What fixes it
- 3.13.0C# DriverCVE List
A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.
Description
The MongoDB C# Driver compares TLS client certificates by issuer and serial number only when deciding whether two clients can share cached connections. In an application that creates clients from certificates supplied by different users, a user who provides a certificate copying another user's issuer and serial number, without that user's private key, can be given connections authenticated with the other user's certificate. Database operations can then run under the other user's identity, affecting the confidentiality and integrity of data that identity can access.
Text from CVE List
Affected versions 1
- C# Driveraffected: 1.8.0 before 3.13.0CVE List