---
id: CVE-2026-67868
title: >-
  A heap-based out-of-bounds write vulnerability exists in S2OPC 1.7.3 in
  server-side EventFilter handling during CreateMonitoredItems processing
summary: >-
  A heap-based out-of-bounds write vulnerability exists in S2OPC 1.7.3 in
  server-side EventFilter handling during CreateMonitoredItems processing. This
  allows a remote attacker to execute arbitrary code.
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-122
published: '2026-08-17'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T16:04:24.933'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-67868'
references:
  - url: 'https://github.com/gff-cw/information/issues/16'
    label: cve@mitre.org
  - url: >-
      https://github.com/systerel/S2OPC/blob/b4c5c7d63cd69698461d514b905a7c92b3c377c4/src/ClientServer/services/b2c/monitored_item_event_filter_treatment_bs.c
    label: cve@mitre.org
  - url: >-
      https://github.com/systerel/S2OPC/blob/b4c5c7d63cd69698461d514b905a7c92b3c377c4/src/ClientServer/services/b2c/monitored_item_event_filter_where_clause_bs.c
    label: cve@mitre.org
  - url: >-
      https://github.com/systerel/S2OPC/tree/S2OPC_Toolkit_1.7.3/samples/ClientServer/demo_server_alarms
    label: cve@mitre.org
  - url: 'https://gitlab.com/systerel/S2OPC/-/work_items/1779'
    label: cve@mitre.org
  - url: 'https://github.com/gff-cw/information/issues/16'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.01063
epssPercentile: 0.63141
ingestedAt: '2026-09-09T16:14:05.513Z'
---

## Overview

A heap-based out-of-bounds write vulnerability exists in S2OPC 1.7.3 in server-side EventFilter handling during CreateMonitoredItems processing. This allows a remote attacker to execute arbitrary code.

## Remediation

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