# CVE-2026-84964

## Summary

- **CVE ID:** CVE-2026-84964
- **Severity:** HIGH
- **CVSS Score:** 8.2 (CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-415
- **Published:** Sep 3, 2026
- **Last Modified:** Sep 3, 2026

## Description

A double free in the OpenSSL-based TLS certificate revocation checking path of the MongoDB C Driver can be reached by a TLS endpoint that the client already trusts. During the handshake, specially formed certificate data can cause the same heap object to be released twice. An unauthenticated party acting as the trusted endpoint may cause the connecting client application to terminate unexpectedly.

## Affected Products

- MongoDB — C Driver (1.17.0)
- MongoDB — C Driver (2.0.0)

## References

- [CNA](https://jira.mongodb.org/browse/CDRIVER-6409)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.15%
- **EPSS Percentile:** 4.2

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