---
id: CVE-2026-109161
title: Buffer Overflow in Digital I/O
summary: >-
  Insufficient bounds checking in the Digital I/O function may allow a remote
  attacker with high privileges to cause a denial of service.
severity: medium
cvss: 4.9
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-120
vendor: Welotec
product: TK100
affected:
  - TK100 >= 0.0.0 < 3.5.116
  - TK500-v2 >= 0.0.0 < 1.0.124
  - TK500-v3 >= 0.0.0 < 1.0.123
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-07T02:41:04.200787Z'
published: '2026-11-03'
updated: '2026-11-07'
sourceUpdated: '2026-11-07T02:41:14.582Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-109161'
references:
  - url: 'https://www.certvde.com/en/advisories/VDE-2026-119/'
tags:
  - cve.org
epss: 0.003
epssPercentile: 0.22832
ingestedAt: '2026-11-05T19:30:42.933Z'
---

## Overview

Insufficient bounds checking in the Digital I/O function may allow a remote attacker with high privileges to cause a denial of service.

## Affected

- `TK100 >= 0.0.0 < 3.5.116`
- `TK500-v2 >= 0.0.0 < 1.0.124`
- `TK500-v3 >= 0.0.0 < 1.0.123`

## Remediation

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