CVE-2026-19003 in BI Connector ODBC Driver
Summary
by MITRE • 08/12/2026
A data source definition containing an over-length file path setting may cause the MongoDB BI Connector ODBC Driver setup dialog to write outside the bounds of an allocated buffer. The issue stems from an incorrect buffer capacity calculation in the dialog's file and folder selection handling, and is reached only when a user opens the setup dialog for such a data source and initiates a file or folder selection. Depending on build configuration, the result may range from abnormal process termination to, under certain conditions, execution of unintended code in the context of the user running the dialog.
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Analysis
by VulDB Data Team • 08/12/2026
This vulnerability exists within the MongoDB BI Connector ODBC Driver setup dialog where improper buffer management leads to potential memory corruption issues. The flaw manifests when a data source definition contains an excessively long file path setting, causing the dialog to write beyond allocated buffer boundaries during file or folder selection operations. The root cause lies in incorrect buffer capacity calculations within the dialog's file and folder selection handling mechanisms, which fail to account for the full length of potentially extended file paths that users might input.
The technical implementation involves a classic buffer overflow condition where the application does not properly validate input lengths before copying data into fixed-size buffers. This type of vulnerability falls under CWE-121 which specifically addresses stack-based buffer overflow conditions, though the actual manifestation may occur in heap memory depending on the driver's internal memory management. The vulnerability is triggered exclusively through user interaction with the setup dialog when initiating file or folder selection processes, making it a user-initiated attack vector rather than an automated exploitation scenario.
Operational impact varies significantly based on build configurations and system environments, creating multiple potential outcomes ranging from simple application crashes and abnormal process termination to more severe consequences involving code execution. Under certain conditions and specific build configurations, this buffer overflow could potentially allow attackers to execute unintended code with the privileges of the user running the dialog, representing a privilege escalation risk. The vulnerability demonstrates characteristics consistent with those described in ATT&CK technique T1059.007 for Windows Command Shell and T1203 for Exploitation for Client Execution, as it enables arbitrary code execution through legitimate application interfaces.
Mitigation strategies should focus on implementing proper input validation and buffer size calculations within the affected dialog components. The most effective approach involves ensuring that all file path inputs are properly truncated or validated against maximum allowable lengths before buffer operations occur. Additionally, developers should implement bounds checking mechanisms and consider using safer string handling functions that automatically prevent buffer overflows. Regular security testing including fuzzing of input fields and comprehensive code reviews focused on memory management practices should be conducted to identify similar vulnerabilities in related components. Organizations should also consider restricting user privileges when running setup dialogs and implementing application whitelisting controls to limit potential exploitation scenarios.