---
title: "Microsoft.WindowsDesktop.App.Runtime.win-arm64 — CVE-2026-87697"
description: "An unsafe deserialisation flaw affects the NuGet package Microsoft.WindowsDesktop.App.Runtime.win-arm64. Affected versions: >= 9.0.0, <= 9.0.20. Fixed from version 9.0.21. CVSS score 8.8."
canonical: https://inyourgeek.com/en/failles-de-securite/2026-10-13-cve-2026-87697
type: faille-de-securite
author: "Sébastien Soulier"
publisher: "InYourGeek"
language: en
datePublished: 2026-10-13
dateModified: 2026-10-13
---
# Microsoft.WindowsDesktop.App.Runtime.win-arm64 — CVE-2026-87697

An unsafe deserialisation flaw affects the NuGet package Microsoft.WindowsDesktop.App.Runtime.win-arm64. Affected versions: >= 9.0.0, <= 9.0.20. Fixed from version 9.0.21. CVSS score 8.8.

## What to do

Update Microsoft.WindowsDesktop.App.Runtime.win-arm64 to 9.0.21 or later.

| Fact | Value |
| --- | --- |
| Package | Microsoft.WindowsDesktop.App.Runtime.win-arm64 |
| Ecosystem | NuGet (.NET) |
| Class | Unsafe deserialisation |
| Affected versions | >= 9.0.0, <= 9.0.20 |
| Fixed version | 9.0.21 |
| CVSS | 8.8 |
| CVE | CVE-2026-87697 |
| GHSA | GHSA-c27m-942f-rcfh |
| Published on | October 13, 2026 |
| Severity | High |

## Sources

- [GitHub Security Advisory — GHSA-c27m-942f-rcfh](https://github.com/advisories/GHSA-c27m-942f-rcfh) — GitHub Security Advisories
- [NVD — CVE-2026-87697](https://nvd.nist.gov/vuln/detail/CVE-2026-87697) — NVD

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