---
id: CVE-2026-85856
title: >-
  Heap-based buffer overflow in Windows Internet Connection Sharing (ICS) allows
  an authorized attacker to execute code over an adjacent network.
summary: >-
  Heap-based buffer overflow in Windows Internet Connection Sharing (ICS) allows
  an authorized attacker to execute code over an adjacent network.
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-122
published: '2026-10-13'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T21:19:28.090'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-85856'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85856'
    label: secure@microsoft.com
tags:
  - nvd
ingestedAt: '2026-10-13T19:43:29.182Z'
---

## Overview

Heap-based buffer overflow in Windows Internet Connection Sharing (ICS) allows an authorized attacker to execute code over an adjacent network.

## Remediation

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