CVE-2026-84965
Medium
Description
An integer wraparound in an allocation size calculation in the BSON library's JSON parsing code can cause a buffer to be released while a following copy operation still writes through the stale pointer. On builds where sizes are 32 bits, an unauthenticated party able to supply a sufficiently large JSON input to an application that links the library may cause that application to terminate unexpectedly, resulting in denial of service.
SeverityMedium
CVSS5.1
Exploit probability—
Product
Mongodb C Driver
PublishedSep 3, 2026
First seenSep 3, 2026
Weakness typeCWE-190Integer overflow
How to fix
Update
- mongodb c_driver1.30.9, 2.5.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mongodb c_driver | 1.10.0 ≤ v < 1.30.9, 2.0.0 ≤ v < 2.5.2 | 1.30.9, 2.5.2 |
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.