MongoDBCVE-2026-81520
A network-reachable client
High8.7CVE-2026-81520 · Published Aug 28, 2026 · updated Sep 1, 2026
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 versions
| Package | Affected | Fixed in |
|---|---|---|
| BI Connector Product | < 2.14.31 | 2.14.31 |
Details and references
- CVSS 4.0
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-1088
More MongoDB advisories
All MongoDB| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| Aug 28 | MongoDB BI Connector: null pointer dereference | High8.3 | 2.14.31 |
| Aug 28 | An unauthenticated party able to reach the port of a MongoDB Connector for BI | High8.7 | 2.14.31 |
| Aug 28 | MongoDB BI Connector: improper certificate validation | High8.7 | 2.14.31 |
| Aug 28 | MongoDB BI Connector ODBC Driver: stack buffer overflow | High8.7 | 1.4.10 |
| Aug 28 | MongoDB BI Connector ODBC Driver: stack buffer overflow | Medium6.0 | 1.4.10 |
| Aug 28 | MongoDB BI Connector: SQL injection | High8.5 | 2.14.31 |