CVE-2026-84964
Medium
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.
SeverityMedium
CVSS5.9
Exploit probability—
Product
Mongodb C Driver
PublishedSep 3, 2026
First seenSep 3, 2026
Weakness typeCWE-415CWE-415
How to fix
Update
- mongodb c_driver1.30.9, 2.5.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mongodb c_driver | 1.17.0 ≤ v < 1.30.9, 2.0.0 ≤ v < 2.5.2 | 1.30.9, 2.5.2 |
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