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CVE-2026-85363 high CVSS 8.8

Vulnerability in Microsoft.WindowsDesktop.App.Runtime.win-arm64 (CVE-2026-85363)

Summary

Vulnerability in Microsoft.WindowsDesktop.App.Runtime.win-arm64 (CVE-2026-85363). Successful exploitation can lead to full system takeover. Mitigation: upgrade to 11.0.0-rc.2 or later.

Original description

The description as published by the source.

Executive summary

Microsoft is releasing this security advisory to provide information about a vulnerability in Microsoft.WindowsDesktop.App.Runtime (WPF). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.

Attacker-controlled XPS glyph coordinates can overflow destination pointer arithmetic in CD3DGlyphBank::RectFillAlpha, causing an out-of-bounds write and process termination.

Announcement

Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/469

CVSS Details

  • Version: 3.1

  • Severity: High

  • Score: 8.8

  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

  • Weakness: CWE-190 (Integer Overflow or Wraparound)

Affected Platforms

  • Platforms: Windows
  • Architectures: All

Affected Packages

The vulnerability affects Microsoft .NET projects that use an affected package version listed below.

Package name Affected version Patched version
Microsoft.WindowsDesktop.App.Runtime.win-arm64 >= 8.0.0, <= 8.0.31 8.0.32
Microsoft.WindowsDesktop.App.Runtime.win-x64 >= 8.0.0, <= 8.0.31 8.0.32
[Microsoft.WindowsDesktop.App.Runtime.win-x86](https://www.nuget.org/packages/Microsoft.WindowsDesktop.App.Runtime.win-x8…

Source: GitHub Security Advisories (Global) NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-85363 has been found in Microsoft.WindowsDesktop.App.Runtime.win-arm64.
Successful exploitation can lead to full system takeover. CVSS score: 8.8/10.
What to do: upgrade Microsoft.WindowsDesktop.App.Runtime.win-arm64 to 11.0.0-rc.2 or later.
If unsure, ask your IT team or search "Microsoft.WindowsDesktop.App.Runtime.win-arm64 CVE-2026-85363" on the vendor's site.

CVE-2026-85363 (Microsoft.WindowsDesktop.App.Runtime.win-arm64) — CWE-190 / CVSS v3 8.8
Attack vector: remote (network-reachable) / unauthenticated
Patched: 11.0.0-rc.2 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (CWE-190) exists in Microsoft.WindowsDesktop.App.Runtime.win-arm64.

📍 Affected scope

Check the vendor advisory for the affected versions of Microsoft.WindowsDesktop.App.Runtime.win-arm64.

🔥 Severity

Severity: High (CVSS 8.8/10). Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to 11.0.0-rc.2.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'Microsoft.WindowsDesktop.App.Runtime.win-arm64' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'Microsoft.WindowsDesktop.App.Runtime.win-arm64' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で Microsoft.WindowsDesktop.App.Runtime.win-arm64 を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade Microsoft.WindowsDesktop.App.Runtime.win-arm64 to 11.0.0-rc.2

    ステージング環境で 11.0.0-rc.2 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  3. 3
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

nuget Microsoft.WindowsDesktop.App.Runtime.win-arm64
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"11.0.0-rc.2"}]}]
nuget Microsoft.WindowsDesktop.App.Runtime.win-x64
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"11.0.0-rc.2"}]}]
nuget Microsoft.WindowsDesktop.App.Runtime.win-x86
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"11.0.0-rc.2"}]}]

References

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