CVE-2026-81529

Summary

Improper neutralization of delimiters in connection-URL construction allows connection-option injection in the MongoDB C# Driver. When an application passes untrusted text into the driver's connection-URL builder and round-trips the builder back into a client configuration, the untrusted text is serialized without neutralizing the URL/option delimiters and is then re-parsed as authoritative connection options. A low-privileged user of such an application can thereby introduce or suppress security-relevant connection settings.

Affected Software

Weaknesses

• CWE-88: CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')

References

• https://jira.mongodb.org/browse/CSHARP-6171
• https://www.nuget.org/packages/MongoDB.Driver/3.11.1

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