Heap overflow via oversized decrypted TLS record sequence in Windows Secure Channel stream
Summary
| CVE | CVE-2026-93393 |
|---|---|
| State | PUBLISHED |
| Assigner | mongodb |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-09-17 21:17:56 UTC |
| Updated | 2026-09-17 21:17:56 UTC |
| 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. |
Risk And Classification
Primary CVSS: v4.0 9.2 CRITICAL from [email protected]
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Problem Types: CWE-787 | CWE-787 CWE-787: Out-of-bounds Write
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | [email protected] | Secondary | 9.2 | CRITICAL | 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/E:X/C... |
| 4.0 | CNA | CVSS | 9.2 | CRITICAL | 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 |
| 3.1 | [email protected] | Secondary | 8.1 | HIGH | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | CNA | CVSS | 8.1 | HIGH | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
CVSS v4.0 Breakdown
Attack Vector
NetworkAttack Complexity
HighAttack Requirements
PresentPrivileges Required
NoneUser Interaction
NoneConfidentiality
HighIntegrity
HighAvailability
HighSub Conf.
NoneSub Integrity
NoneSub Availability
NoneCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
HighPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | MongoDB Inc. | C Driver | affected 2.4.0 semver | Windows |
| CNA | MongoDB Inc. | C Driver | affected 2.3.0 2.3.3 semver | Windows |
| CNA | MongoDB Inc. | C Driver | affected 2.2.0 2.2.4 semver | Windows |
| CNA | MongoDB Inc. | C Driver | affected 2.1.0 2.1.2 semver | Windows |
| CNA | MongoDB Inc. | C Driver | affected 2.0.0 2.0.2 semver | Windows |
| CNA | MongoDB Inc. | C Driver | affected 1.30.0 1.30.8 semver | Windows |
| CNA | MongoDB Inc. | C Driver | affected 1.29.0 1.29.2 semver | Windows |
| CNA | MongoDB Inc. | C Driver | affected 1.28.0 1.28.1 semver | Windows |
| CNA | MongoDB Inc. | C Driver | affected 1.27.0 1.27.6 semver | Windows |
| CNA | MongoDB Inc. | C Driver | affected 1.26.0 1.26.2 semver | Windows |
| CNA | MongoDB Inc. | C Driver | affected 1.25.0 1.25.4 semver | Windows |
| CNA | MongoDB Inc. | C Driver | affected 1.24.0 1.24.4 semver | Windows |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| jira.mongodb.org/browse/CDRIVER-6417 | [email protected] | jira.mongodb.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.