CVE-2026-81533 MongoDB BI Connector ODBC Driver Memory-Safety Issue When Parsing Oversized LIMIT Values

Medium 6.0 Published 28 Aug 2026 Updated 31 Aug 2026

An attacker can cause memory corruption or denial of service in applications using the MongoDB BI Connector ODBC Driver by submitting oversized LIMIT values when prefetch is enabled.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-81533?

CVE-2026-81533 is a medium-severity memory corruption vulnerability in MongoDB BI Connector ODBC Driver, published on 28 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official 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.

Weakness: CWE-121

Which versions are affected by CVE-2026-81533?

It affects 1 product.

Products include Mongodb Bi Connector Odbc Driver.

How do I fix CVE-2026-81533?

No fix has been published for CVE-2026-81533 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-81533 being exploited?

There is no known exploitation of CVE-2026-81533 in the wild and no public exploit code.

Sources

Also known as GHSA-gj6m-p8hr-868g.