CVE-2026-81529
HighCVSS 7.1Exploitation Probability (EPSS)
Low risk7th percentile - higher than 7% of all known CVEs
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 it back into client configuration, the untrusted text is serialized without neutralizing URL/option delimiters and then re-parsed as authoritative connection options.
Risk Assessment
A low-privileged user can introduce or suppress security-relevant connection settings, potentially leading to unauthorized access or weakened security.
Recommendation
Validate and sanitize all input before using it in the connection-URL builder, and update the driver to a patched version.
Original NVD description (English source)
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.