# CVE-2026-114649: Authentication bypass via issuer-and-serial-only certificate equality in shared cluster cache

> CVE-2026-114649: Authentication bypass via issuer-and-serial-only certificate equality in shared cluster cache. CVSS 6.8 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-114649
Last updated: 2026-10-23T19:45:03Z

- Published: 2026-10-22 19:13 UTC · Updated: 2026-10-23 19:45 UTC · Assigner: mongodb
- CVSS: 6.8 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
- EPSS: 0.20%, 10th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-1025

## 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.

## Affected vendors and products

- MongoDB: C\# Driver

## Tracked companies

- [MongoDB Atlas](https://rewindex.com/company/mongodb-atlas.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-114649)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-114649)
- [https://github.com/mongodb/mongo-csharp-driver/releases/tag/v3.13.0](https://github.com/mongodb/mongo-csharp-driver/releases/tag/v3.13.0)
- [https://github.com/mongodb/mongo-csharp-driver/security/advisories/GHSA-6gjm-424r-3jh2](https://github.com/mongodb/mongo-csharp-driver/security/advisories/GHSA-6gjm-424r-3jh2)
- [https://jira.mongodb.org/browse/CSHARP-6184](https://jira.mongodb.org/browse/CSHARP-6184)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-114649 · Markdown: https://rewindex.com/cve/CVE-2026-114649.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-114649 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:11:07.898Z