CVE-2026-93393 — Heap overflow via oversized decrypted TLS record sequence in Windows Secure Channel stream
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 connec…
Published: 2026-09-17 · CVSS: 9.2 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7