CVE-2026-81529
Connection-option injection via unescaped settings in the canonical MongoDB URL builder
CVSS Score
7.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-88 |
| Vendor | mongodb |
| Product | c# driver |
| Ecosystems | |
| Industries | Technology |
| Published | Aug 27, 2026 |
| Last Updated | Aug 27, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
Low
Availability
None
Affected Versions
MongoDB / C# Driver
3.5.0 < 3.11.1