← Back
CVE-2026-35433
high
CVSS 7.3
Vulnerability in Microsoft.WindowsDesktop.App.Runtime.win-arm64 (CVE-2026-35433)
Summary
vulnerability in Microsoft.WindowsDesktop.App.Runtime.win-arm64 (CVE-2026-35433). Confidential information can be exposed externally. Mitigation: upgrade to `10.0.8` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-35433** has been found in Microsoft.WindowsDesktop.App.Runtime.win-arm64.
Confidential information can be exposed externally. CVSS score: 7.3/10.
What to do: upgrade Microsoft.WindowsDesktop.App.Runtime.win-arm64 to **10.0.8** or later.
If unsure, ask your IT team or search "Microsoft.WindowsDesktop.App.Runtime.win-arm64 CVE-2026-35433" on the vendor's site.
CVE-2026-35433 (Microsoft.WindowsDesktop.App.Runtime.win-arm64) — CWE-20 / CVSS v3 7.3
Attack vector: local / unauthenticated
Patched: `10.0.8` — 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-20) exists in Microsoft.WindowsDesktop.App.Runtime.win-arm64.
📍 Affected scope
Microsoft.WindowsDesktop.App.Runtime.win-arm64 — .
🔥 Severity
Severity: High (CVSS 7.3/10). Confidential information can be exposed externally
🔧 How to fix
Update to **10.0.8**.
🛡️ 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 (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify 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。
-
6Apply patch patch
Upgrade Microsoft.WindowsDesktop.App.Runtime.win-arm64 to 10.0.8ステージング環境で 10.0.8 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と、Step 3 で見つけた異常検知の続報チェックを含めること。
-
7Post-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 Step 3 と同じログクエリ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":"10.0.8"}]}]
nuget
Microsoft.WindowsDesktop.App.Runtime.win-x64
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"10.0.8"}]}]
nuget
Microsoft.WindowsDesktop.App.Runtime.win-x86
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"10.0.8"}]}]
References
- package https://github.com/dotnet/wpf
- web https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-35433
- web https://github.com/dotnet/wpf/security/advisories/GHSA-8x9c-mqxv-q2pp
- web https://nvd.nist.gov/vuln/detail/CVE-2026-35433
- web https://github.com/dotnet/announcements/issues/398
- web https://github.com/advisories/GHSA-8x9c-mqxv-q2pp
- web https://access.redhat.com/security/cve/CVE-2026-35433
- web https://bugzilla.redhat.com/show_bug.cgi?id=2476577
- web https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-35433.json