External risk intelligence

MongoDB BI Connector ODBC Driver Buffer Overflow Vulnerability.

CVE advisorySeverity: CRITICAL (CVSS 9.5)

CVE-2026-19001

The vulnerability resides in a database driver (ODBC) used by client applications to connect to MongoDB. Database drivers are typically integrated into internal applications or middleware and are not directly exposed to the public internet as standalone network services.

Integer Overflow

Halo Surface Signal: 2 out of 5 — less likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

The MongoDB BI Connector ODBC Driver has a critical vulnerability that could lead to memory corruption and potentially arbitrary code execution. This occurs when the driver encounters unusually long names for catalogs, schemas, or objects, causing it to write beyond a buffer's limits. While the primary concern is confirming relevance and exposure due to the driver's typical use within applications, the potential impact if exploited is severe.

Driver vulnerability risks memory corruption and code execution.
This affects applications connecting to MongoDB using the driver.
Confirm relevance and impact for connected applications.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by interacting with an application that uses the MongoDB BI Connector ODBC Driver. When the application sends an unusually long name for a catalog, schema, or object to a metadata retrieval function, the driver may mishandle this input, leading to memory corruption. This could cause the application to crash or, in some scenarios, allow the attacker to execute arbitrary code.

No authentication or privileges needed.
Long names sent to metadata retrieval functions.
Potential for code execution and crashes.

Live Threat

Current exploitation, exposure, and threat context

The MongoDB BI Connector ODBC Driver could cause memory corruption within an application's process when processing unusually long metadata names, potentially leading to crashes or, under certain conditions, arbitrary code execution. This impacts applications that use the driver to interact with MongoDB.

Application memory corruption.
Long metadata names supplied to driver.
Process crash or potential code execution.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability impacts the MongoDB BI Connector ODBC Driver, potentially leading to memory corruption and arbitrary code execution when processing unusually long metadata names. Identifying affected applications and confirming their exposure and criticality is the first step, followed by an assessment of responsible teams, which may include application owners, platform teams, or database administrators, to plan remediation.

Application owners should manage the issue.
Verify affected application reachability and criticality.
Plan remediation based on identified risk.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is the MongoDB BI Connector ODBC Driver?

This software acts as a translator, allowing various BI and reporting tools to communicate with MongoDB databases using the standard ODBC interface. It is typically embedded within client applications, such as reporting suites or custom data analysis tools, to help them understand the structure of the database.

How does CVE-2026-19001 cause memory corruption?

This vulnerability is a buffer overflow, categorized as CWE-190. It happens when the driver attempts to store excessively long metadata names—like specific catalog or schema identifiers—into a fixed-size memory space that is too small to hold them. This overwrite can corrupt adjacent memory, leading to program crashes or unauthorized execution paths.

Do I need to send malicious packets to trigger this bug?

No. The issue is not triggered by arbitrary network packets, but rather by the specific inputs an application provides to the driver. If your application logic passes an unusually long metadata name to a database metadata retrieval function, the driver may fail. Standard database queries that do not involve long metadata strings will not trigger this condition.

Why does Halo Surface Signal consider this 'Unlikely' to be exposed?

Halo Surface Signal labels this as unlikely because the driver operates within the memory space of a client application, not as a standalone public-facing network service. Since it is usually a backend component, the risk depends on whether your internal applications are configured to process untrusted or malformed metadata names from external sources.

How should I respond to CVE-2026-19001?

Start by identifying all internal applications and reporting tools that utilize the MongoDB BI Connector ODBC driver. Once mapped, coordinate with your application owners to review the data handling processes and prioritize updates for systems that interact with external or untrusted data sources. Check vendor documentation for the latest driver versions.

References

github.com/mongodb/mongo-bi-connector-odbc-driver/releases/tag/v…

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.