---
id: CVE-2026-81738
title: >-
  OpenVPN 2.5.0 through 2.7.6 on Windows using the tap-windows6 driver allows
  attackers to trigger an out-of-bounds write via crafted DOMAIN-SEARCH entries
summary: >-
  OpenVPN 2.5.0 through 2.7.6 on Windows using the tap-windows6 driver allows
  attackers to trigger an out-of-bounds write via crafted DOMAIN-SEARCH entries
severity: low
cvss: 2.3
cvssVector: 'CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:N/VI:L/VA:L/SC:N/SI:L/SA:L'
cwe:
  - CWE-121
  - CWE-193
  - CWE-787
vendor: OpenVPN
product: OpenVPN
affected:
  - OpenVPN >= 2.5.0 <= 2.7.6
published: '2026-09-07'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T19:07:52.113'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-81738'
references:
  - url: 'https://community.openvpn.net/Security%20Announcements/CVE-2026-81738'
    label: security@openvpn.net
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-81738.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-81738'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-81738'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-81738'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00331
epssPercentile: 0.23562
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-08T14:54:55.935316Z'
cvssSource: cna
ingestedAt: '2026-09-08T15:33:26.975Z'
scores:
  cna: 2.3
  vendor: 4.2
---

## Overview

OpenVPN 2.5.0 through 2.7.6 on Windows using the tap-windows6 driver allows attackers to trigger an out-of-bounds write via crafted DOMAIN-SEARCH entries

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · updated 2026-09-08 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-81738.json)