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.

Attack Vector Network

Attack Complexity High

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00468.

Exploitation none

Automatable no

Technical Impact total

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
MongoDB Inc. C Driver unaffected
Version Status Constraints
2.4.0 affected —
2.3.0 affected ≤ 2.3.3
2.2.0 affected ≤ 2.2.4
2.1.0 affected ≤ 2.1.2
2.0.0 affected ≤ 2.0.2
1.30.0 affected ≤ 1.30.8
1.29.0 affected ≤ 1.29.2
1.28.0 affected ≤ 1.28.1
1.27.0 affected ≤ 1.27.6
1.26.0 affected ≤ 1.26.2
1.25.0 affected ≤ 1.25.4
1.24.0 affected ≤ 1.24.4

Configuration 1 [-]

OR cpe:2.3:a:mongodb:c_driver:*:*:*:*:*:mongodb:*:*
cpe:2.3:a:mongodb:c_driver:*:*:*:*:*:mongodb:*:*

No data.

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Vendors Products
Mongodb Subscribe
C Driver Subscribe

Project Subscriptions

Vendors Products
Mongodb Subscribe
C Driver Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://jira.mongodb.org/browse/CDRIVER-6417 cve-icon cve-icon
History

Tue, 29 Sep 2026 19:30:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:mongodb:c_driver:*:*:*:*:*:mongodb:*:*

Fri, 18 Sep 2026 21:30:00 +0000

Type Values Removed Values Added
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, or an attacker able to impersonate or redirect the client's connection, can cause the driver to write attacker-supplied data outside the bounds of a heap allocation while processing incoming encrypted traffic. No authentication or user interaction is required, because the affected processing occurs before any application-level authentication completes. Successful exploitation may lead to memory corruption in the client process, disclosure of adjacent heap memory, or termination of the process. 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.
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Fri, 18 Sep 2026 13:30:00 +0000

Type Values Removed Values Added
First Time appeared Mongodb
Mongodb c Driver
Vendors & Products Mongodb
Mongodb c Driver

Thu, 17 Sep 2026 20:45:00 +0000

Type Values Removed Values Added
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, or an attacker able to impersonate or redirect the client's connection, can cause the driver to write attacker-supplied data outside the bounds of a heap allocation while processing incoming encrypted traffic. No authentication or user interaction is required, because the affected processing occurs before any application-level authentication completes. Successful exploitation may lead to memory corruption in the client process, disclosure of adjacent heap memory, or termination of the process.
Title Heap overflow via oversized decrypted TLS record sequence in Windows Secure Channel stream
Weaknesses CWE-787
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.2, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mongodb

Published:

Updated: 2026-09-18T17:35:11.797Z

Reserved: 2026-09-17T20:10:59.785Z

Link: CVE-2026-93393

cve-icon Vulnrichment

Updated: 2026-09-18T17:33:29.998Z

cve-icon NVD

Status : Analyzed

Published: 2026-09-17T21:17:56.163

Modified: 2026-09-29T19:17:54.137

Link: CVE-2026-93393

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-19T16:30:17Z

Weaknesses