CVE-2026-114649
Authentication bypass via issuer-and-serial-only certificate equality in shared cluster cache
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| C# Driver MongoDB |
≥ 1.8.0; < 3.13.0 (affected, semver)
Other versions: unaffected |
CNA: mongodb |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 7.6 high |
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N | CNA: mongodb |
| 3.1 / 6.8 medium |
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N | CNA: mongodb |
Exploit evidence
- https://github.com/mongodb/mongo-csharp-driver/security/advisories/GHSA-6gjm-424r-3jh2
exploit · ADP: CISA-ADP
References
- https://jira.mongodb.org/browse/CSHARP-6184CNA: mongodb
- https://github.com/mongodb/mongo-csharp-driver/releases/tag/v3.13.0CNA: mongodb
- https://github.com/mongodb/mongo-csharp-driver/security/advisories/GHSA-6gjm-424r-3jh2CNA: mongodb
- https://github.com/mongodb/mongo-csharp-driver/security/advisories/GHSA-6gjm-424r-3jh2ADP: CISA-ADP · exploit