---
id: CVE-2026-85880
title: >-
  Heap-based buffer overflow in Windows ALPC allows an authorized attacker to
  elevate privileges locally.
summary: >-
  Heap-based buffer overflow in Windows ALPC allows an authorized attacker to
  elevate privileges locally.
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-122
  - CWE-908
vendor: microsoft
product: windows_10_1607
affected:
  - windows_10_1607 < 10.0.14393.9512
  - windows_10_1809 < 10.0.17763.9245
  - windows_10_21h2 < 10.0.19044.7725
  - windows_10_22h2 < 10.0.19045.7725
  - windows_server_2012
  - windows_server_2012 = r2
  - windows_server_2016 < 10.0.14393.9512
  - windows_server_2019 < 10.0.17763.9245
  - windows_server_2022 < 10.0.20348.5622
patched:
  - windows_10_1607 10.0.14393.9512
  - windows_10_1809 10.0.17763.9245
  - windows_10_21h2 10.0.19044.7725
  - windows_10_22h2 10.0.19045.7725
  - windows_server_2016 10.0.14393.9512
  - windows_server_2019 10.0.17763.9245
  - windows_server_2022 10.0.20348.5622
published: '2026-09-08'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T23:19:20.773'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-85880'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85880'
    label: secure@microsoft.com
  - url: >-
      https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-85880
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - kev
  - in-the-wild
  - cve.org
  - exploit-available
epss: 0.03616
epssPercentile: 0.89047
kev: true
kevDateAdded: '2026-09-08'
kevDueDate: '2026-09-22'
kevRansomware: false
exploited: true
zeroDay: true
exploitAvailable: true
ssvc:
  exploitation: active
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-08T18:44:18.362923Z'
ingestedAt: '2026-09-08T19:08:49.634Z'
---

## Overview

Heap-based buffer overflow in Windows ALPC allows an authorized attacker to elevate privileges locally.

## Affected

- `windows_10_1607 < 10.0.14393.9512`
- `windows_10_1809 < 10.0.17763.9245`
- `windows_10_21h2 < 10.0.19044.7725`
- `windows_10_22h2 < 10.0.19045.7725`
- `windows_server_2012`
- `windows_server_2012 = r2`
- `windows_server_2016 < 10.0.14393.9512`
- `windows_server_2019 < 10.0.17763.9245`
- `windows_server_2022 < 10.0.20348.5622`

## Remediation

Upgrade past the affected range:

- `windows_10_1607 10.0.14393.9512`
- `windows_10_1809 10.0.17763.9245`
- `windows_10_21h2 10.0.19044.7725`
- `windows_10_22h2 10.0.19045.7725`
- `windows_server_2016 10.0.14393.9512`
- `windows_server_2019 10.0.17763.9245`
- `windows_server_2022 10.0.20348.5622`