What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-22 · updated 2026-10-23
• Weakness: CWE-694

Description

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.

Affected products

• MongoDB C# Driver: from 1.8.0 before 3.13.0 — fixed in 3.13.0

How to fix

Upgrade to a fixed version: MongoDB C# Driver 3.13.0. Check the vendor advisory for mitigations.

References

• https://github.com/mongodb/mongo-csharp-driver/releases/tag/v3.13.0
• https://github.com/mongodb/mongo-csharp-driver/security/advisories/GHSA-mqvm-xxqr-vqw5
• https://jira.mongodb.org/browse/CSHARP-6179

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