CVE-2026-81533

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Memory Corruption in MongoDB BI Connector ODBC Driver

Publication date: 2026-08-28

Last updated on: 2026-09-11

Assigner: MongoDB, Inc.

Description

An application using the MongoDB BI Connector ODBC Driver may encounter a memory-safety issue when a submitted SQL statement contains an unusually long run of digits following a LIMIT clause. The issue occurs only on connections where the driver's optional prefetch setting is enabled, and stems from the driver copying the digit sequence into a fixed-size internal buffer without checking its length. A user able to influence the numeric portion of a LIMIT clause could cause the hosting application process to terminate unexpectedly or corrupt adjacent memory in that process.

CVSS Scores

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Meta Information

Published

2026-08-28

Last Modified

2026-09-11

Generated

2026-09-18

AI Q&A

2026-08-29

EPSS Evaluated

2026-09-15

NVD

CVE-2026-81533

EUVD

EUVD-2026-67943

Affected Vendors & Products

Vendor	Product	Version / Range
mongodb	bi_connector_odbc_driver	to 1.4.10 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-121	A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

Attack-Flow Graph

Executive Summary

This vulnerability is a memory-safety issue in the MongoDB BI Connector ODBC Driver. It occurs when a SQL statement with an unusually long sequence of digits after a LIMIT clause is submitted. The driver copies this digit sequence into a fixed-size buffer without checking its length. This can lead to the application process crashing or memory corruption if the prefetch setting is enabled.

Detection Guidance

This vulnerability can be detected by monitoring for crashes or memory corruption in applications using the MongoDB BI Connector ODBC Driver with the prefetch setting enabled. Check logs for SQL statements with unusually long digit sequences after LIMIT clauses. No specific commands are provided in the context.

Impact Analysis

If you use the MongoDB BI Connector ODBC Driver with the prefetch setting enabled, an attacker could exploit this flaw by submitting a malicious SQL query. This could cause the application to crash or corrupt memory, potentially leading to denial of service or unauthorized access to data.

Compliance Impact

This vulnerability may impact compliance with standards like GDPR and HIPAA by potentially exposing sensitive data through memory corruption or application termination. If exploited, it could lead to unauthorized access or data leaks, violating confidentiality requirements in these regulations.

Mitigation Strategies

Disable the prefetch setting in the MongoDB BI Connector ODBC Driver configuration. Update to the latest driver version if available. Restrict user access to influence LIMIT clause values. Monitor application processes for unexpected terminations or memory corruption.

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