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CVE PROGRAM SOURCE RECORD9.2 Critical

CVE-2026-93393

Heap overflow via oversized decrypted TLS record sequence in Windows Secure Channel stream

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

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

MongoDB Inc. C Driver

Default version status: unaffected

  • 2.4.0affected
  • 2.3.0 to ≤ 2.3.3affected
  • 2.2.0 to ≤ 2.2.4affected
  • 2.1.0 to ≤ 2.1.2affected
  • 2.0.0 to ≤ 2.0.2affected
  • 1.30.0 to ≤ 1.30.8affected
  • 1.29.0 to ≤ 1.29.2affected
  • 1.28.0 to ≤ 1.28.1affected
  • 1.27.0 to ≤ 1.27.6affected
  • 1.26.0 to ≤ 1.26.2affected
  • 1.25.0 to ≤ 1.25.4affected
  • 1.24.0 to ≤ 1.24.4affected

References