CVE-2026-81520
MongoDB Connector for BI Unbounded Authentication Negotiation Leading to Connection Exhaustion
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
A network-reachable client that has not yet authenticated can hold a MongoDB Connector for BI authentication session open indefinitely by beginning a SASL-based login exchange and then declining to complete it. Because the negotiation loop had no overall time bound and the read from the client had no deadline, each such session retains a worker, a client connection slot, and its associated backend database connections until the process is restarted. Repeated use of this behavior can consume the configured connection capacity and prevent legitimate users from establishing new sessions.
| CWE | CWE-1088 |
| Vendor | mongodb |
| Product | bi connector |
| Ecosystems | |
| Industries | Technology |
| Published | Aug 28, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
MongoDB / BI Connector
0 < 2.14.31