CVSS 9.2 (critical) ยท published 2026-09-17
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.
Affected products (NVD): mongodb c_driver
Fixed in (NVD): 1.30.11, 2.5.4
Weakness: CWE-787
Source: NVD CVE-2026-93393
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