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9.2
CVE-2026-93393: MongoDB C Driver on Windows can corrupt memory
CVE-2026-93393 · published 24 days ago
Summary
The MongoDB C Driver built for Windows can be tricked by a remote server into writing data past the end of its memory space when processing encrypted traffic. This can cause the client program to crash, reveal nearby memory contents, or stop working, even before any user login occurs. Apply the latest driver update or rebuild without the Windows TLS backend to protect your systems.
What to do
- Update debian mongo-c-driver to version 2.5.5-1.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| – | mongodb inc. | c driver | 2.4.0 |
| Debian:12 | debian | mongo-c-driver | All versions |
| Ubuntu:Pro:20.04:LTS | canonical | mongo-c-driver | All versions |
| Debian:14 | debian | mongo-c-driver |
< 2.5.5-1 Fix: upgrade to 2.5.5-1
|
| – | mongodb | c_driver |
>= 1.10.0, < 1.30.11 >= 2.2.0, < 2.5.4 cpe:2.3:a:mongodb:c_driver:*:*:*:*:*:mongodb:*:* |
Original advisory text
Heap overflow via oversized decrypted TLS record sequence in Windows Secure Channel stream
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.
References
- https://jira.mongodb.org/browse/CDRIVER-6417 Vendor Advisory
- https://security-tracker.debian.org/tracker/CVE-2026-93393 Vendor Advisory
- https://ubuntu.com/security/CVE-2026-93393 Third Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2026-93393 Third Party Advisory
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93393... Vendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-93393 Vendor Advisory
Internet-facing
14 days
Internal
At next upgrade
- Not known to be exploited
- Needs hands-on effort to exploit
- Gives an attacker full control
Type
CWE-787Out-of-bounds Write
Timeline
Published17 Sep 2026
Updated11 Oct 2026
First seen17 Sep 2026
Sources
CVE-2026-93393 · NVD
CVE-2026-93393 · MITRE
DEBIAN-CVE-2026-93393 · OSV
UBUNTU-CVE-2026-93393 · OSV
CVE-2026-93393 · OSV
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