# CVE-2026-114645: MongoDB C Driver integer wraparound in Kerberos/SSPI authentication

Source: https://junglewise.ai/threats/cve-2026-114645-a-32-bit-integer-wraparound-in-the-mongodb-c-driver-s-windows  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-22. Updated: 2026-10-22  
License: CC BY 4.0 with a link back

CVE-2026-114645 · Severity: medium · CVSS 5.2 · Published 2026-10-22

The MongoDB C Driver, used by applications to connect to MongoDB databases, contains a buffer overflow vulnerability in its Windows authentication code when handling long credential values. An attacker who can control a client's connection configuration could cause the client application to crash or become unstable by triggering memory corruption.

Technologies: [MongoDB C Driver](https://junglewise.ai/threats/technologies/c-driver). Vendors: [MongoDB](https://junglewise.ai/threats/vendors/mongodb).

## Quick answers

**Is CVE-2026-114645 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-114645 being exploited in the wild.

**How severe is CVE-2026-114645?** Medium severity, with a CVSS score of 5.2, published 22 October 2026.

**Which products and versions are affected?** MongoDB C Driver versions prior to 1.30.14 and 2.5.7.

**Is there a fix for CVE-2026-114645?** Yes: fixed in C Driver 1.30.14, 2.5.7. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-114645 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2026-114645?** Check whether you run MongoDB C Driver at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in C Driver 1.30.14, 2.5.7

## Technical details

A 32-bit integer wraparound in the Windows-only Kerberos/SSPI authentication backend causes undersized heap buffer allocation when excessively long credential values are supplied in client connection configuration. An attacker controlling client-side configuration can trigger an out-of-bounds write, corrupting client process memory. The vulnerability exists only in Windows builds using the native authentication backend and requires the ability to modify client connection configuration.

## Affected products

- MongoDB C Driver versions prior to 1.30.14 and 2.5.7

## Timeline

- 2026-10-22: disclosed
- 2026-10-22: patched

## References

- [https://github.com/mongodb/mongo-c-driver/releases/tag/1.30.14](https://github.com/mongodb/mongo-c-driver/releases/tag/1.30.14)
- [https://github.com/mongodb/mongo-c-driver/releases/tag/2.5.7](https://github.com/mongodb/mongo-c-driver/releases/tag/2.5.7)

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