---
id: CVE-2026-67865
title: S2OPC 1.7.3 contains an out-of-bounds read in RepublishResponse handling
summary: >-
  S2OPC 1.7.3 contains an out-of-bounds read in RepublishResponse handling. This
  allows a remote attacker to cause a denial of service
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-125
published: '2026-08-05'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T16:04:24.933'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-67865'
references:
  - url: >-
      https://github.com/systerel/S2OPC/blob/S2OPC_Toolkit_1.7.3/src/ClientServer/services/b2c/msg_subscription_publish_ack_bs.c
    label: cve@mitre.org
  - url: >-
      https://github.com/systerel/S2OPC/blob/S2OPC_Toolkit_1.7.3/src/ClientServer/services/b2c/msg_subscription_publish_bs.c
    label: cve@mitre.org
  - url: >-
      https://github.com/systerel/S2OPC/blob/S2OPC_Toolkit_1.7.3/src/Common/opcua_types/sopc_encoder.c
    label: cve@mitre.org
  - url: >-
      https://github.com/systerel/S2OPC/blob/S2OPC_Toolkit_1.7.3/tests/ClientServer/CMakeLists.txt
    label: cve@mitre.org
  - url: 'https://gitlab.com/systerel/S2OPC/-/work_items/1785'
    label: cve@mitre.org
  - url: 'https://gitlab.com/systerel/S2OPC/-/work_items/1785'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00505
epssPercentile: 0.42195
ingestedAt: '2026-09-09T16:14:05.512Z'
---

## Overview

S2OPC 1.7.3 contains an out-of-bounds read in RepublishResponse handling. This allows a remote attacker to cause a denial of service

## Remediation

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