# CVE-2026-114643: Duplicate geometry fields via unvalidated GeoJSON extra members

Status: published. Published: 2026-10-22. Updated: 2026-11-02.

The MongoDB C# Driver writes GeoJSON extra members without checking whether their names collide with reserved GeoJSON members such as type and coordinates. An application that places user-supplied field names into these extra members can store documents with duplicate geometry fields, so the server and the driver resolve different values for the same record. Affected records can also become unreadable through the driver, interrupting application code that reads them.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- MongoDB / C# Driver: ≥ 1.8.0; < 3.13.0 (affected, semver). Source: CNA: mongodb

## Severity and prioritization

- CVSS 4.0: 5.3 (medium); CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N; source: CNA: mongodb

- CVSS 3.1: 5.4 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L; source: CNA: mongodb

- CISA KEV: No listing in collected sources

- EPSS: 0.37% as of 2026-11-02; percentile 31.13%

- SSVC: exploitation poc; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-694

## Exploit evidence

- exploit: https://github.com/mongodb/mongo-csharp-driver/security/advisories/GHSA-mqvm-xxqr-vqw5 (ADP: CISA-ADP)

## References

- https://jira.mongodb.org/browse/CSHARP-6179 (CNA: mongodb)

- https://github.com/mongodb/mongo-csharp-driver/releases/tag/v3.13.0 (CNA: mongodb)

- https://github.com/mongodb/mongo-csharp-driver/security/advisories/GHSA-mqvm-xxqr-vqw5 (CNA: mongodb)

- https://github.com/mongodb/mongo-csharp-driver/security/advisories/GHSA-mqvm-xxqr-vqw5 (ADP: CISA-ADP; exploit)

## Provenance

- CNA: mongodb: https://www.cve.org/CVERecord?id=CVE-2026-114643; retrieved 2026-11-02; source updated 2026-11-02

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-114643; retrieved 2026-11-02; source updated Not reported

Revision: 85bd8323342851aa4d9ac018b485abf220a9bb1ff9b61e3e05ebc2123c2ce2dc

Canonical: https://y2.dev/cve/CVE-2026-114643

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