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CVE-2026-70174

8.8 high SSVC exploitation: none Published
NVD · CVE.org

Improperly implemented security check for standard in .NET allows an unauthorized attacker to execute code over a network.

Fix

Microsoft's update · Important

  • Release Notes — Microsoft Visual Studio 2026 version 18.10 · build 18.10.4 · restart required
  • Release Notes — .NET 11.0 runtime installed on Windows · build 11.0.0-rc.2
  • Release Notes — Microsoft Visual Studio 2022 version 17.14 · build 17.14.42 · restart required
  • KB5130036 — .NET 10.0 runtime installed on Windows · build 10.0.13
  • KB5130034 — .NET 8.0 runtime installed on Windows · build 8.0.32
  • KB5130035 — .NET 9.0 runtime installed on Windows · build 9.0.21
  • KB5127689 — Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 21H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 22H2 · build 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0
  • KB5127690 — Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 24H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 25H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2025 · build 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0
  • KB5127691 — Microsoft .NET Framework 4.8.1 on Windows 11 version 26H1 · build 4.8.9363.0
  • KB5127692 — Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 23H2 · build 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0
  • KB5127693 — Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022 · build 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0
  • KB5127694 — Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 26H2 · build 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.10008.0
  • KB5127696 — Microsoft .NET Framework 3.5 on Windows 11 version 26H1 · build 2.0.50727.9188 AND 3.0.30729.9171
  • KB5127660 — Microsoft .NET Framework 3.5 on Windows Server 2012 · build 2.0.50727.8987 AND 3.0.30729.8982
  • KB5127664 — Microsoft .NET Framework 3.5 on Windows Server 2012 R2 · build 2.0.50727.8987 AND 3.0.30729.8982
  • KB5126868 — Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 version 1607, Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016 · build 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0
  • KB5127666 — Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2019, Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 version 1809 · build 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0
  • KB5127685 — Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 1809, Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019 · build 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0
  • KB5127683 — Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 21H2, Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 22H2 · build 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.4811.0
  • KB5127687 — Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022 · build 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.4811.0
  • KB5127667 — Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 · build 4.7.4150.0
  • KB5127668 — Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2 · build 4.7.4150.0
  • KB5127684 — Microsoft .NET Framework 4.8 on Windows 10 version 1607, Microsoft .NET Framework 4.8 on Windows Server 2016 · build 4.8.4811.0
  • KB5127686 — Microsoft .NET Framework 4.8 on Windows Server 2012 · build 4.8.4811.0

From the 2026-Oct release note of Microsoft's Security Update Guide, revised 2026-10-28 · Exploitation Less Likely.

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 4

  1. StatusAwaiting Analysis → PublishedNVD modified 2026-10-22 21:50
  2. StatusPublished → Awaiting AnalysisNVD modified 2026-10-22 22:18
  3. StatusAwaiting Analysis → PublishedNVD modified 2026-10-19 19:35
  4. First seenCVSS 8.8NVD modified 2026-10-14 04:18

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 1