---
id: "CVE-2026-125136"
page: "https://infrastack.ai/live/CVE-2026-125136"
kind: "vulnerability"
aliases: ["CVE-2026-125136"]
title: "Windows Auto-Setup Service: heap overflow lets attacker run code over network"
severity: "high"
cvss: 8.8
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: [{"name": "Windows 10 1607", "fixed": ["10.0.14393.9688"], "affected": "< 10.0.14393.9688", "ecosystem": "microsoft"}, {"name": "Windows 10 1809", "fixed": ["10.0.17763.9487"], "affected": "< 10.0.17763.9487", "ecosystem": "microsoft"}, {"name": "Windows 10 21H2", "fixed": ["10.0.19044.7846"], "affected": "< 10.0.19044.7846", "ecosystem": "microsoft"}, {"name": "Windows 10 22H2", "fixed": ["10.0.19045.7846"], "affected": "< 10.0.19045.7846", "ecosystem": "microsoft"}, {"name": "Windows 11 23H2", "fixed": ["10.0.22631.7711"], "affected": "< 10.0.22631.7711", "ecosystem": "microsoft"}, {"name": "Windows 11 24H2", "fixed": ["10.0.26100.9974"], "affected": "< 10.0.26100.9974", "ecosystem": "microsoft"}, {"name": "Windows 11 25H2", "fixed": ["10.0.26200.9974"], "affected": "< 10.0.26200.9974", "ecosystem": "microsoft"}, {"name": "Windows 11 26H1", "fixed": ["10.0.28000.3501"], "affected": "< 10.0.28000.3501", "ecosystem": "microsoft"}, {"name": "Windows 11 26H2", "fixed": ["10.0.26300.9974"], "affected": "< 10.0.26300.9974", "ecosystem": "microsoft"}]
ecosystems: []
tags: ["adjacent-network", "infrastructure", "network-devices", "windows"]
not_affected_if: ["unknown"]
published_at: "2026-11-10T19:21:07+00:00"
first_seen_at: "2026-11-10T19:25:14+00:00"
updated_at: "2026-11-10T21:25:48+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-125136", "first_seen_at": "2026-11-10T19:25:14+00:00"}, {"source": "analyst", "url": "https://nvd.nist.gov/vuln/detail/cve-2026-125136", "first_seen_at": "2026-11-10T21:25:48+00:00", "cites": ["https://nvd.nist.gov/vuln/detail/cve-2026-125136"]}]
exploit_sources: []
---

# Windows Auto-Setup Service: heap overflow lets attacker run code over network

Link for people: https://infrastack.ai/live/CVE-2026-125136 (this .md is for agents)

A heap-based buffer overflow in the Windows Network Connected Devices Auto-Setup Service lets an unauthorized attacker execute code. The attack works from an adjacent network, so an attacker on the same local network segment can reach it.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- microsoft:Windows 10 1607 affected < 10.0.14393.9688 fixed 10.0.14393.9688
- microsoft:Windows 10 1809 affected < 10.0.17763.9487 fixed 10.0.17763.9487
- microsoft:Windows 10 21H2 affected < 10.0.19044.7846 fixed 10.0.19044.7846
- microsoft:Windows 10 22H2 affected < 10.0.19045.7846 fixed 10.0.19045.7846
- microsoft:Windows 11 23H2 affected < 10.0.22631.7711 fixed 10.0.22631.7711
- microsoft:Windows 11 24H2 affected < 10.0.26100.9974 fixed 10.0.26100.9974
- microsoft:Windows 11 25H2 affected < 10.0.26200.9974 fixed 10.0.26200.9974
- microsoft:Windows 11 26H1 affected < 10.0.28000.3501 fixed 10.0.28000.3501
- microsoft:Windows 11 26H2 affected < 10.0.26300.9974 fixed 10.0.26300.9974

## How to check

Run winver or [Environment]::OSVersion in PowerShell and compare the full build number (e.g. 10.0.26100.xxxx) to the fixed builds listed under fix. A build below the fixed one is vulnerable. Exposure also needs the attacker on the same adjacent network.

## Fix

Install the November 2026 Patch Tuesday cumulative update for your Windows build. Fixed builds: Win10 1607 10.0.14393.9688, 1809 10.0.17763.9487, 21H2 10.0.19044.7846, 22H2 10.0.19045.7846; Win11 23H2 10.0.22631.7711, 24H2 10.0.26100.9974, 25H2 10.0.26200.9974, 26H1 10.0.28000.3501, 26H2 10.0.26300.9974.

## Timeline

- 2026-11-10T19:25:14+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-125136
- 2026-11-10T21:25:48+00:00 analyst https://nvd.nist.gov/vuln/detail/cve-2026-125136 — Read Microsoft CNA data via NVD (MSRC page is JS-only, not readable); builds/fixes from there, not verified. Service default state and KB numbers unknown. No exploitation or PoC found.

## Documents

- [describes] NVD CVE-2026-125136 (Microsoft CNA data) https://nvd.nist.gov/vuln/detail/cve-2026-125136

## From the sources

Heap-based buffer overflow in Windows Network Connected Devices Auto-Setup Service allows an unauthorized attacker to execute code over an adjacent network.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_