CVE-2026-81532: CWE-121: Stack-based Buffer Overflow in MongoDB BI Connector ODBC Driver
Description
CVE-2026-81532 is a high-severity stack-based buffer overflow vulnerability in the MongoDB BI Connector ODBC driver. It occurs when a user submits a positioned-cursor SQL statement with a cursor name longer than an internal fixed-length buffer. This causes memory adjacent to the buffer to be overwritten, potentially terminating the hosting application or allowing unintended code execution.
CVSS v4.0
Score 8.7high
Affected software
MongoDB
BI Connector ODBC Driver
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability arises from improper bounds checking on the cursor name length in the MongoDB BI Connector ODBC driver. When a positioned-cursor statement with an excessively long cursor name is processed, the driver constructs a diagnostic message without limiting the name length, leading to a stack-based buffer overflow (CWE-121). This overflow can corrupt memory adjacent to the buffer, causing application crashes or enabling arbitrary code execution within the context of the hosting application.
Potential Impact
Exploitation can cause the hosting application process to terminate unexpectedly or may allow execution of arbitrary code within that process. This can lead to denial of service or potential privilege escalation depending on the hosting application's context.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, avoid submitting positioned-cursor SQL statements with excessively long cursor names through the MongoDB BI Connector ODBC driver.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mongodb
- Date Reserved
- 2026-08-26T22:32:57.937Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a9206c9acd9273b4963cf61
Added to database: 08/28/2026, 22:08:09 UTC
Last enriched: 09/07/2026, 15:28:24 UTC
Last updated: 10/13/2026, 18:48:24 UTC
Views: 103
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