Vulnerability · Published Aug 12, 2026 · Assigned by mongodb
CVE-2026-18888MongoDB BI Connector ODBC driver may write outside an allocated buffer when retrieving large floating point values as character data
Medium 6.5
In plain English
A medium-severity out-of-bounds write in BI Connector ODBC Driver from MongoDB. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities).
Official description
The MongoDB BI Connector ODBC Driver converts floating point column values into text without checking that the result fits within the destination buffer. When an application reads a sufficiently large floating point value as text, the driver may write beyond the end of that buffer and corrupt adjacent memory. A user who can store data in a collection read through the BI Connector could use this to crash the application performing the read.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| MongoDB | BI Connector ODBC Driver | 1.0.0 – before 1.4.9 |
Weakness: CWE-787 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H