What’s Vulnerable › Vulnerabilities
CVE-2026-93393: Heap overflow via oversized decrypted TLS record sequence in Windows Secure Channel stream
- Severity: high (CVSS 8.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.5% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-09-17 · updated 2026-09-29
- Weakness: CWE-787
Description
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
- MongoDB C# Driver: from 1.10.0 before 1.30.11; from 2.2.0 before 2.5.4 — fixed in 1.30.11, 2.5.4
How to fix
Upgrade to a fixed version: MongoDB C# Driver 1.30.11, 2.5.4. Check the vendor advisory for mitigations.
References
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