---
id: CVE-2026-109576
title: HMS Networks PEAK-System PCAN Windows drivers Out-of-bounds Write
summary: >-
  The parser in PEAK-System PCAN driver correctly detected the malformed record,
  but the loop iterating the record list advanced its processed-bytes counter
  even when a record had been rejected as invalid.
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-787
vendor: HMS Networks
product: PEAK-System Device Driver Setup
affected:
  - peak-system_device_driver_setup <= 5.1.2.1151
  - pcan_windows_can_device_drivers <= 5.1.2
published: '2026-10-20'
updated: '2026-10-20'
sourceUpdated: '2026-10-20T20:16:18.220Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-109576'
references:
  - url: 'https://www.hms-networks.com/cybersecurity'
  - url: 'https://www.peak-system.com/support/downloads/software/'
  - url: 'https://www.cisa.gov/news-events/ics-advisories/icsa-26-293-01'
  - url: >-
      https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-293-01.json
tags:
  - cve.org
ingestedAt: '2026-10-20T21:19:21.288Z'
---

## Overview

The parser in PEAK-System PCAN driver correctly detected the malformed record, but the loop iterating the record list advanced its processed-bytes counter even when a record had been rejected as invalid.

## Affected

- `peak-system_device_driver_setup <= 5.1.2.1151`
- `pcan_windows_can_device_drivers <= 5.1.2`

## Remediation

HMS Networks AB has addressed the issue in version 5.1.4 and recommends that users upgrade to the newest available version.  Users can find software updates for PEAK-System PCAN on the  software download page https://www.peak-system.com/support/downloads/software/ .




For more information see the associated  HMS security advisory https://www.hms-networks.com/cybersecurity .