Heap-based buffer overflow in MongoDB driver for C - CVE-2026-93393
Published: September 22, 2026
Vulnerability identifier: #VU151671
CSH Severity: High
CVSS v4: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-93393
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to a heap-based buffer overflow in the TLS transport layer of the MongoDB C Driver when processing incoming encrypted traffic through the Windows platform TLS backend. A remote attacker can send an oversized decrypted TLS record sequence to write attacker-supplied data outside a heap allocation and execute arbitrary code.
Only builds using the Windows platform TLS backend are affected.
Affected software
MongoDB driver for C
How to mitigate CVE-2026-93393
Install security update from vendor's website.
MongoDB driver for C - addressed in versions 1.30.11, 2.5.4