Heap-based Buffer Overflow in MongoDB BI Connector ODBC Driver

Publication date: 2026-08-12

Last updated on: 2026-08-12

Assigner: MongoDB, Inc.

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.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-08-12

Last Modified

2026-08-12

Generated

2026-08-13

AI Q&A

2026-08-13

EPSS Evaluated

N/A

NVD

CVE-2026-18888

Affected Vendors & Products

Vendor	Product	Version / Range
mongodb	bi_connector_odbc_driver	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-787	The product writes data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

Executive Summary

The MongoDB BI Connector ODBC Driver has a flaw where it converts large floating point values into text without verifying if the result fits in the destination buffer. This can cause the driver to write past the buffer's end, corrupting adjacent memory. An attacker who can store data in a collection accessed via the BI Connector could exploit this to crash the application reading the data.

Impact Analysis

If you use the MongoDB BI Connector ODBC Driver, an attacker with write access to a database could crash applications that read data through the connector. This could lead to denial-of-service conditions, disrupting services dependent on the BI Connector.

Mitigation Strategies

Update the MongoDB BI Connector ODBC Driver to the latest version provided by MongoDB to address the buffer overflow issue in floating point value handling.

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