CVE-2026-18888: MongoDB BI Connector Odbc Driver

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

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

• MongoDB BI Connector Odbc Driver: from 1.0.0, before 1.4.9 (fixed in 1.4.9)

Published 2026-08-12. Last modified 2026-09-11.