What’s Vulnerable › Vulnerabilities
CVE-2026-81520: MongoDB Connector for BI Unbounded Authentication Negotiation Leading to Connection Exhaustion
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-08-28 · updated 2026-09-29
- Weakness: CWE-1088
Description
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.
Affected products
- MongoDB BI Connector: before 2.14.31 — fixed in 2.14.31
How to fix
Upgrade to a fixed version: MongoDB BI Connector 2.14.31. Check the vendor advisory for mitigations.
References
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