mongo-c-driver: A double free in the OpenSSL-based TLS certificate revocation checking path of the MongoDB C Driver can be reached by...
CVE-2026-84964 is fixed in mongo-c-driver on 1 platform by DEBIAN-CVE-2026-84964 (version 2.5.2-1), released September 10, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| mongo-c-driver · Debian 14 | 2.5.2-1 | DEBIAN-CVE-2026-84964 | Sep 10, 2026 |
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