---
id: CVE-2026-88964
title: >-
  An integer underflow in OpenVPN version 2.7_alpha3 through 2.7.7 on Windows
  and Android allows remote authenticated servers to cause a denial of service
  or memory disclosure via crafted domain search options
summary: >-
  An integer underflow in OpenVPN version 2.7_alpha3 through 2.7.7 on Windows
  and Android allows remote authenticated servers to cause a denial of service
  or memory disclosure via crafted domain search options
severity: high
cvss: 7.1
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N'
cwe:
  - CWE-125
  - CWE-191
vendor: OpenVPN
product: OpenVPN
affected:
  - OpenVPN >= 2.7_alpha3 <= 2.7.7
published: '2026-10-13'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T20:38:04.303'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-88964'
references:
  - url: 'https://community.openvpn.net/Security%20Announcements/CVE-2026-88964'
    label: security@openvpn.net
tags:
  - nvd
  - cve.org
epss: 0.00378
epssPercentile: 0.31598
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-14T18:09:00.654409Z'
cvssSource: cna
ingestedAt: '2026-10-14T00:07:19.220Z'
---

## Overview

An integer underflow in OpenVPN version 2.7_alpha3 through 2.7.7 on Windows and Android allows remote authenticated servers to cause a denial of service or memory disclosure via crafted domain search options

## Remediation

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