CVE-2026-93393 MongoDB C Driver - Buffer Overflow

MongoDB C Driver contains a heap-based buffer overflow caused by improper bounds checking in the TLS transport layer on Windows platform TLS backend, letting remote attackers cause memory corruption or process termination, exploit requires no authentication or user interaction.

CVSS base score 8.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.47% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Buffer Overflow
Impact
Denial Of Service, Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
17 September 2026
Updated
15 October 2026
Weakness
CWE-787

Vendor fix

Update to the latest version of MongoDB C Driver with the fix applied.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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