---
id: CVE-2026-75348
title: >-
  An out-of-bounds read vulnerability exists in EIPStackGroup OpENer v2.3 and
  master up to commit 76b95cf in the EtherNet/IP TCP SendRRData Common Packet
  Format parser
summary: >-
  An out-of-bounds read vulnerability exists in EIPStackGroup OpENer v2.3 and
  master up to commit 76b95cf in the EtherNet/IP TCP SendRRData Common Packet
  Format parser. The issue occurs in CreateCommonPacketFormatStructure() when it
  parses…
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: '2026-10-09'
updated: '2026-10-09'
sourceUpdated: '2026-10-09T18:17:13.893'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-75348'
references:
  - url: >-
      https://github.com/EIPStackGroup/OpENer/blob/master/source/src/enet_encap/cpf.c
    label: cve@mitre.org
  - url: >-
      https://github.com/EIPStackGroup/OpENer/blob/master/source/src/enet_encap/encap.c
    label: cve@mitre.org
  - url: >-
      https://github.com/EIPStackGroup/OpENer/blob/master/source/src/enet_encap/endianconv.c
    label: cve@mitre.org
  - url: 'https://github.com/EIPStackGroup/OpENer/issues/573'
    label: cve@mitre.org
  - url: 'https://github.com/EIPStackGroup/OpENer/issues/573'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-75348.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-75348'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-75348'
tags:
  - nvd
  - csaf
  - vex
  - red-hat
  - cve.org
  - exploit-available
ingestedAt: '2026-10-09T17:04:42.812Z'
vendor: Red Hat
epss: 0.00505
epssPercentile: 0.42948
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-09T16:56:20.547425Z'
---

## Overview

An out-of-bounds read vulnerability exists in EIPStackGroup OpENer v2.3 and master up to commit 76b95cf in the EtherNet/IP TCP SendRRData Common Packet Format parser. The issue occurs in CreateCommonPacketFormatStructure() when it parses recognized optional socket address information items of type 0x8000 or 0x8001 without first validating that the remaining CPF buffer contains the complete fixed sockaddr structure. 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.

## Vendor advisories

- **Red Hat VEX** · updated 2026-10-09 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-75348.json)