CVE-2026-106437
Medium
Description
The BSON buffer-reservation API in the MongoDB C Driver can record a length smaller than the five-byte BSON minimum. Later append or comparison operations can underflow unsigned length calculations and read or write outside the document buffer. An actor who can influence the length supplied by an embedding application can cause the application to terminate or read or corrupt adjacent process memory. Reaching this issue requires the application to pass an undersized value to bson_reserve_buffer and then perform an affected operation.
SeverityMedium
CVSS6.2
Exploit probability—
Product
Mongodb C Driver
PublishedOct 8, 2026
First seenOct 8, 2026
Weakness typeCWE-191CWE-191
How to fix
Update
- mongodb c_driver1.30.13, 2.5.6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mongodb c_driver | 1.4.0 ≤ v < 1.30.13, 2.0.0 ≤ v < 2.5.6 | 1.30.13, 2.5.6 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.