# CVE-2026-19003: MongoDB BI Connector ODBC Driver buffer overflow in DSN path handling

Source: https://junglewise.ai/threats/cve-2026-19003-mongodb-bi-connector-odbc-driver-buffer-overflow-in-dsn-path  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-12. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-19003 · Severity: high · CVSS 7.8 · Published 2026-08-12

The MongoDB BI Connector ODBC Driver is a database connector that allows applications to access MongoDB data through standard database interfaces. A buffer overflow flaw in the setup dialog's file path handling could allow an attacker to crash the application or execute arbitrary code when a user opens the setup dialog for a malicious data source and selects a file or folder.

Technologies: [MongoDB Bi Connector Odbc Driver](https://junglewise.ai/threats/technologies/bi-connector-odbc-driver). Vendors: [MongoDB](https://junglewise.ai/threats/vendors/mongodb).

## Quick answers

**Is CVE-2026-19003 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-19003 being exploited in the wild.

**How severe is CVE-2026-19003?** High severity, with a CVSS score of 7.8, published 12 August 2026.

**Which products and versions are affected?** MongoDB Bi Connector Odbc Driver before 1.4.9.

**Is there a fix for CVE-2026-19003?** A patch was published on 2026-08-06: Fixed in version 1.4.9 with logic to clamp DSN path field sizes Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-19003 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2026-19003?** Check whether you run MongoDB Bi Connector Odbc Driver at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is a classic stack or heap buffer overflow (CWE-120) caused by incorrect buffer capacity calculation in the ODBC Driver setup dialog's file and folder selection logic. The flaw is triggered when a data source definition contains an over-length file path setting, and is reachable only when a user interacts with the dialog by opening it and initiating a file or folder selection operation. An attacker can craft a malicious data source file with an oversized path value; when a user opens this in the setup dialog and attempts to browse for files/folders, the buffer overflow occurs. Depending on compile-time protections and memory layout, this can result in denial of service (crash) or arbitrary code execution in the context of the user running the dialog. MongoDB has patched this issue in version 1.4.9 by adding logic to clamp DSN path field sizes.

## Affected products

- MongoDB BI Connector ODBC Driver before 1.4.9

## Timeline

- 2026-08-12: disclosed: CVE published on NVD
- 2026-08-06: patched: Fixed in version 1.4.9 with logic to clamp DSN path field sizes

## References

- [https://github.com/mongodb/mongo-bi-connector-odbc-driver/releases/tag/v1.4.9](https://github.com/mongodb/mongo-bi-connector-odbc-driver/releases/tag/v1.4.9)

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