What’s Vulnerable › Vulnerabilities

CVE-2026-114648: NoSQL injection via dot and dollar characters in LINQ filter field names and dictionary keys

• Severity: high (CVSS 7.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% 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-943

Description

The MongoDB C# Driver does not neutralize dot and dollar characters in dictionary keys, field names and array-filter identifiers used in LINQ queries before placing them into the field paths it sends to the server. An application user whose input reaches these positions can redirect a query or update to fields the application did not name, which can expose other users' documents and widen updates beyond the intended data. Certain values can also write malformed fields that leave stored documents unreadable by the application until they are repaired.

Affected products

• MongoDB C# Driver: from 2.14.0 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-2xqr-fxmx-2cmf
• https://jira.mongodb.org/browse/CSHARP-6181

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