What is CVE-2026-84964?

CVE-2026-84964 is a medium-severity vulnerability, classified under Double Free. CVSS score: 5.9/10. Published 2026-09-03.

How severe is CVE-2026-84964?

Medium severity. CVSS v3 base score is 5.9 out of 10.

CVE-2026-84964

CVE-2026-84964

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.

Vulnerability class: Double Free

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

Weakness classification (CWE)

CWE-415 — Double Free

References

cna@mongodb.com

Frequently asked questions

What is CVE-2026-84964?: CVE-2026-84964 is a medium-severity vulnerability, classified under Double Free. CVSS score: 5.9/10. Published 2026-09-03.
How severe is CVE-2026-84964?: Medium severity. CVSS v3 base score is 5.9 out of 10.