---
id: "CVE-2026-94531"
page: "https://infrastack.ai/live/CVE-2026-94531"
kind: "vulnerability"
aliases: ["CVE-2026-94531"]
title: "Windows COM: stack buffer overflow lets a local user gain higher privileges"
severity: "high"
cvss: 7.8
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: [{"name": "Windows COM", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "Windows 10 1607 / Server 2016", "fixed": ["10.0.14393.9688"], "affected": "< 10.0.14393.9688", "ecosystem": "vendor"}, {"name": "Windows 10 1809 / Server 2019", "fixed": ["10.0.17763.9487"], "affected": "< 10.0.17763.9487", "ecosystem": "vendor"}, {"name": "Windows 10 21H2", "fixed": ["10.0.19044.7846"], "affected": "< 10.0.19044.7846", "ecosystem": "vendor"}, {"name": "Windows 10 22H2", "fixed": ["10.0.19045.7846"], "affected": "< 10.0.19045.7846", "ecosystem": "vendor"}, {"name": "Windows 11 23H2", "fixed": ["10.0.22631.7711"], "affected": "< 10.0.22631.7711", "ecosystem": "vendor"}, {"name": "Windows 11 24H2", "fixed": ["10.0.26100.9974"], "affected": "< 10.0.26100.9974", "ecosystem": "vendor"}, {"name": "Windows 11 25H2", "fixed": ["10.0.26200.9974"], "affected": "< 10.0.26200.9974", "ecosystem": "vendor"}, {"name": "Windows 11 26H1", "fixed": ["10.0.28000.3501"], "affected": "< 10.0.28000.3501", "ecosystem": "vendor"}, {"name": "Windows 11 26H2", "fixed": ["10.0.26300.9974"], "affected": "< 10.0.26300.9974", "ecosystem": "vendor"}, {"name": "Windows Server 2022", "fixed": ["10.0.20348.5870"], "affected": "< 10.0.20348.5870", "ecosystem": "vendor"}, {"name": "Windows Server 2025", "fixed": ["10.0.26100.33822"], "affected": "< 10.0.26100.33822", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["com", "infrastructure", "local-accounts", "privilege-escalation", "windows"]
not_affected_if: ["patched-build"]
published_at: "2026-11-10T19:21:38+00:00"
first_seen_at: "2026-11-10T19:25:21+00:00"
updated_at: "2026-11-10T20:34:58+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-94531", "first_seen_at": "2026-11-10T19:25:21+00:00"}, {"source": "analyst", "url": "https://app.opencve.io/cve/CVE-2026-94531", "first_seen_at": "2026-11-10T20:34:58+00:00", "cites": ["https://app.opencve.io/cve/CVE-2026-94531"]}]
exploit_sources: []
---

# Windows COM: stack buffer overflow lets a local user gain higher privileges

Link for people: https://infrastack.ai/live/CVE-2026-94531 (this .md is for agents)

Microsoft's CVE record (CWE-121) describes a stack-based buffer overflow in Windows COM that lets an authorized local attacker elevate privileges. CVSS 3.1 is 7.8 (AV:L/PR:L/UI:N). It is not in KEV, and the record marks exploit code maturity as unproven. Fixed builds are listed per Windows version; KB article numbers were not read.

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

## Affected

- vendor:Windows COM affected range not listed fixed no fixed version listed
- vendor:Windows 10 1607 / Server 2016 affected < 10.0.14393.9688 fixed 10.0.14393.9688
- vendor:Windows 10 1809 / Server 2019 affected < 10.0.17763.9487 fixed 10.0.17763.9487
- vendor:Windows 10 21H2 affected < 10.0.19044.7846 fixed 10.0.19044.7846
- vendor:Windows 10 22H2 affected < 10.0.19045.7846 fixed 10.0.19045.7846
- vendor:Windows 11 23H2 affected < 10.0.22631.7711 fixed 10.0.22631.7711
- vendor:Windows 11 24H2 affected < 10.0.26100.9974 fixed 10.0.26100.9974
- vendor:Windows 11 25H2 affected < 10.0.26200.9974 fixed 10.0.26200.9974
- vendor:Windows 11 26H1 affected < 10.0.28000.3501 fixed 10.0.28000.3501
- vendor:Windows 11 26H2 affected < 10.0.26300.9974 fixed 10.0.26300.9974
- vendor:Windows Server 2022 affected < 10.0.20348.5870 fixed 10.0.20348.5870
- vendor:Windows Server 2025 affected < 10.0.26100.33822 fixed 10.0.26100.33822

## How to check

Run winver or [Environment]::OSVersion / (Get-ItemProperty 'HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion').UBR and compare the build with the fixed builds (e.g. Windows 11 24H2 and 25H2 need 10.0.26100/26200.9974 or later; Server 2022 needs 10.0.20348.5870 or later). Install the November 2026 cumulative update.

## Fix

Install the Microsoft November 2026 security update that raises the build to at least the fixed build for your version (listed in the product rows). KB numbers not confirmed.

## Timeline

- 2026-11-10T19:25:21+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-94531
- 2026-11-10T20:34:58+00:00 analyst https://app.opencve.io/cve/CVE-2026-94531 — Microsoft's MSRC page returned no text; affected builds taken from OpenCVE mirror of the Microsoft CVE record (secondary), so nothing verified. KB numbers unknown; settle at the MSRC update guide. No exploitation or PoC found.

## Documents

- [describes] OpenCVE: CVE-2026-94531 (mirror of Microsoft CVE record) https://app.opencve.io/cve/CVE-2026-94531

## From the sources

Stack-based buffer overflow in Windows COM allows an authorized attacker to elevate privileges locally.

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