# CVE-2026-88035

## Summary

- **CVE ID:** CVE-2026-88035
- **Severity:** MEDIUM
- **CVSS Score:** 5.7 (CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-190
- **Published:** Sep 10, 2026
- **Last Modified:** Sep 10, 2026

## Description

A size check in the client-side authentication path of the MongoDB C Driver can wrap around, so an unusually large user-name value is accepted and copied past the end of a small buffer. A party able to set the driver's connection settings may cause the application that embeds the driver to terminate unexpectedly. Reaching this code requires a build in which the optional external SASL authentication backend is present and a connection configured to use it.

## Affected Products

- MongoDB — C Driver (2.2.0)

## References

- [CNA](https://jira.mongodb.org/browse/CDRIVER-6416)

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._