CVE-2026-18888 Memory corruption in BI Connector ODBC Driver

High 7.1 Published 12 Aug 2026 Updated 13 Aug 2026

A buffer overflow in the MongoDB BI Connector ODBC driver allows attackers to crash applications by storing large floating point values.

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-2026-18888?

CVE-2026-18888 is a high-severity memory corruption vulnerability in MongoDB BI Connector ODBC Driver, published on 12 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

The MongoDB BI Connector ODBC Driver converts floating point column values into text without checking that the result fits within the destination buffer. When an application reads a sufficiently large floating point value as text, the driver may write beyond the end of that buffer and corrupt adjacent memory. A user who can store data in a collection read through the BI Connector could use this to crash the application performing the read.

Weakness: CWE-787

Which versions are affected by CVE-2026-18888?

It affects 1 product.

Products include Mongodb Bi Connector Odbc Driver.

How do I fix CVE-2026-18888?

No fix has been published for CVE-2026-18888 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-2026-18888 being exploited?

There is no known exploitation of CVE-2026-18888 in the wild and no public exploit code.

Sources

Also known as GHSA-hcwq-44xg-qq4g, UBUNTU-CVE-2026-18888.