CVE-2026-93393

mongo-c-driver: A heap-based buffer overflow exists in the TLS transport layer of the MongoDB C Driver when built with the Windows pl...

CVE-2026-93393 is fixed in mongo-c-driver on 1 platform by DEBIAN-CVE-2026-93393 (version 2.5.5-1), released October 1, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine
CVSS
n/a
No vendor severity
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0047
40th percentile

A heap-based buffer overflow exists in the TLS transport layer of the MongoDB C Driver when built with the Windows platform TLS backend. A remote endpoint that the client connects to can cause the driver to write uncontrolled data outside the bounds of a heap allocation while processing incoming encrypted traffic after the TLS handshake completes. No authentication or user interaction is required, because the affected processing occurs before any application-level authentication completes. Triggering this issue may lead to memory corruption in the client process, disclosure of adjacent heap memory, or termination of the process.

Where it's fixed

ProductFixed inFixReleased
Linux
mongo-c-driver · Debian 14 2.5.5-1 DEBIAN-CVE-2026-93393 Oct 1, 2026

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