# CVE-2026-114650: Plaintext exposure of encrypted fields via ANSI code-page corruption of database name

> CVE-2026-114650: Plaintext exposure of encrypted fields via ANSI code-page corruption of database name. CVSS 5.9 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-114650
Last updated: 2026-10-23T19:45:03Z

- Published: 2026-10-22 19:13 UTC · Updated: 2026-10-23 19:45 UTC · Assigner: mongodb
- CVSS: 5.9 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
- EPSS: 0.11%, 1th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-838

## Description

A flaw in the client-side encryption support of the MongoDB .NET/C\# driver can cause data designated for client-side field-level encryption to be written without encryption. Under certain platform text-encoding configurations, an internal name conversion loses information, so the encryption layer fails to associate the operation with its configured encryption rules and the operation proceeds without an error being raised. An application user with the ability to write data through an affected application can therefore have sensitive fields persisted in plaintext, defeating the confidentiality guarantee that client-side encryption is intended to provide. No integrity or availability impact was observed.

## Affected vendors and products

- MongoDB: C\# Driver
- MongoDB: MongoDB.Libmongocrypt NuGet package

## Tracked companies

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

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-114650)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-114650)
- [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-jvpx-6w8x-h6rg](https://github.com/mongodb/mongo-csharp-driver/security/advisories/GHSA-jvpx-6w8x-h6rg)
- [https://jira.mongodb.org/browse/CSHARP-6180](https://jira.mongodb.org/browse/CSHARP-6180)

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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-2026-114650 · Markdown: https://rewindex.com/cve/CVE-2026-114650.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-114650 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:13:19.858Z