---
id: CVE-2026-106428
title: >-
  An out-of-bounds read in SCRAM authentication response parsing in the MongoDB
  C Driver can read one byte beyond a fixed-size buffer when processing a
  malformed server-final message
summary: >-
  An out-of-bounds read in SCRAM authentication response parsing in the MongoDB
  C Driver can read one byte beyond a fixed-size buffer when processing a
  malformed server-final message. A server or network intermediary able to
  provide this m…
severity: low
cvss: 3.7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L'
cwe:
  - CWE-125
published: '2026-10-08'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T20:49:23.240'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-106428'
references:
  - url: 'https://jira.mongodb.org/browse/CDRIVER-6370'
    label: cna@mongodb.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-106428.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-106428'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-106428'
tags:
  - nvd
  - csaf
  - vex
  - red-hat
  - cve.org
ingestedAt: '2026-10-08T20:06:22.181Z'
vendor: Red Hat
epss: 0.00239
epssPercentile: 0.14857
product: C Driver
affected:
  - c_driver >= 1.1.0 < 1.30.13
  - c_driver >= 2.0.0 < 2.4.0
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-08T19:17:06.582493Z'
---

## Overview

An out-of-bounds read in SCRAM authentication response parsing in the MongoDB C Driver can read one byte beyond a fixed-size buffer when processing a malformed server-final message. A server or network intermediary able to provide this message before server-signature verification can cause the application using the driver to terminate. The extra byte is not returned through the protocol.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · updated 2026-10-09 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-106428.json)