CVE-2026-70354HighCVSS 7.8

.NET Core Remote Code Execution Vulnerability

Published
August 14, 2026
Last Modified
—

🔗 CVE IDs covered (1)

CVE-2026-70354 →

📋 Description

Out-of-bounds write in .NET allows an unauthorized attacker to execute code locally.

🎯 Affected products63

  • .NET 10.0 installed on Windows
  • .NET 8.0 installed on Windows
  • .NET 9.0 installed on Windows
  • Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 Version 1607 for 32-bit Systems
  • Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 Version 1607 for x64-based Systems
  • Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016
  • Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016 (Server Core installation)
  • Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for 32-bit Systems
  • Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for ARM64-based Systems
  • Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for x64-based Systems
  • Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2019
  • Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2019 (Server Core installation)
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for 32-bit Systems
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for ARM64-based Systems
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for x64-based Systems
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for 32-bit Systems
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for ARM64-based Systems
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for x64-based Systems
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 22H2 for 32-bit Systems
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 22H2 for ARM64-based Systems
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 22H2 for x64-based Systems
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019 (Server Core installation)
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022 (Server Core installation)
  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 21H2 for 32-bit Systems
  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 21H2 for ARM64-based Systems
  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 21H2 for x64-based Systems
  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 22H2 for 32-bit Systems
  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 22H2 for ARM64-based Systems
  • +33 more not shown

✅ Remediation

KB5120418 (Security Update) — fixed build 2.0.50727.8984 & 3.0.30729.8980 & 4.7.4144.0 KB5120716 (Security Update) — fixed build 2.0.50727.8984 & 3.0.30729.8980 KB5120747 (Security Update) — fixed build 2.0.50727.9183 & 3.0.30729.9169 KB5120695 (Security Update) — fixed build 2.0.50727.8984 & 3.0.30729.8980 KB5120703 (Security Update) — fixed build 2.0.50727.9070 & 3.0.30729.9068 & 4.8.4805.0 KB5120698 (Security Update) — fixed build 2.0.50727.9070 & 3.0.30729.9068 & 4.7.4144.0 KB5120701 (Security Update) — fixed build 2.0.50727.9183 & 3.0.30729.9169 & 4.8.4805.0 KB5120705 (Security Update) — fixed build 2.0.50727.9183 & 3.0.30729.9169 & 4.8.4805.0 KB5120709 (Security Update) — fixed build 2.0.50727.9183 & 3.0.30729.9169 & 4.8.9343.0 KB5120714 (Security Update) — fixed build 2.0.50727.9183 & 3.0.30729.9169 & 4.8.9343.0 KB5120700 (Security Update) — fixed build 4.7.4144.0 KB5120699 (Security Update) — fixed build 4.7.4144.0 KB5120702 (Security Update) — fixed build 4.8.4805.0 KB5120704 (Security Update) — fixed build 4.8.4805.0 Security Update — fixed build 18.8.3 Security Update — fixed build 17.14.38 KB5122105 (Security Update) — fixed build 9.0.19 KB5122104 (Security Update) — fixed build 8.0.30 KB5122106 (Security Update) — fixed build 10.0.11 KB5120708 (Security Update) — fixed build 2.0.50727.9183 & 3.0.30729.9169 & 4.8.9344.0 KB5120710 (Security Update) — fixed build 2.0.50727.9183 & 3.0.30729.9169 & 4.8.9343.0 KB5120713 (Security Update) — fixed build 2.0.50727.9183 & 3.0.30729.9169 & 4.8.9343.0 KB5120706 (Security Update) — fixed build 4.8.4805.0 KB5120711 (Security Update) — fixed build 4.8.9344.0

🔗 References (45)