# CVE-2026-84965

## Summary

- **CVE ID:** CVE-2026-84965
- **Severity:** MEDIUM
- **CVSS Score:** 5.9 (CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-190
- **Published:** Sep 3, 2026
- **Last Modified:** Sep 3, 2026

## 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.

## Affected Products

- MongoDB — C Driver (1.10.0)
- MongoDB — C Driver (2.0.0)

## References

- [CNA](https://jira.mongodb.org/browse/CDRIVER-6405)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.10%
- **EPSS Percentile:** 0.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._