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TI-2026-72269 Aliases CVE-2026-70197GHSA-4mpw-cpwj-hxxj

Out-of-bounds write in .NET allows remote code execution

Priority LOW 39CWE-787Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub, Red Hat and Microsoft. Impact type from Microsoft.

Summary

Microsoft .NET 8.0, 9.0, 10.0 and 11.0 installed on Linux, Mac OS and Windows, and their runtimes, are affected in versions before the fixed builds. An out-of-bounds write (CWE-787) in .NET lets an unauthorized attacker on the network execute code. Microsoft rates exploitation as less likely and reports no public disclosure or exploitation.

Written with Claude Haiku 5.5 from the sources below · 2026-10-27

Description from the CNA

Out-of-bounds write in .NET allows an unauthorized attacker to execute code over a network.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00788 56th percentileScored 2026-11-07
Fix Fixed Microsoft.NETCore.App.Runtime.win-arm64 (NuGet): 8.0.33, 11.0.0-rc.3.26522.148, 9.0.22 +1Microsoft.NETCore.App.Runtime.win-x64 (NuGet): 8.0.33, 11.0.0-rc.3.26522.148, 9.0.22 +1+1 more productRed Hat: 1 advisoryMicrosoft: 6 updates

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Microsoft.NET 10.0 installed on Linux10.0.0 to before 10.0.40310.0.403Patch availableCNA
Microsoft.NET 10.0 installed on Mac OS10.0.0 to before 10.0.40310.0.403Patch availableCNA
Microsoft.NET 10.0 installed on Windows10.0.0 to before 10.0.40310.0.403Patch availableCNA
Microsoft.NET 10.0 runtime10.0.0 to before 10.0.1310.0.13Patch availableCNA
Microsoft.NET 11.0 installed on Linux11.0.0-preview.1 to before 11.0.100-rc.311.0.100-rc.3Patch availableCNA
Microsoft.NET 11.0 installed on Mac OS11.0.0-preview.1 to before 11.0.100-rc.311.0.100-rc.3Patch availableCNA
Microsoft.NET 11.0 installed on Windows11.0.0-preview.1 to before 11.0.100-rc.3.26522.14811.0.100-rc.3.26522.148Patch availableCNA
Microsoft.NET 11.0 runtime11.0.0 to before 11.0.0-rc.211.0.0-rc.2Patch availableCNA
Microsoft.NET 8.0 installed on Linux8.0.0 to before 8.0.4278.0.427Patch availableCNA
Microsoft.NET 8.0 installed on Mac OS8.0.0 to before 8.0.4278.0.427Patch availableCNA
Microsoft.NET 8.0 installed on Windows8.0.0 to before 8.0.4278.0.427Patch availableCNA
Microsoft.NET 8.0 runtime8.0.0 to before 8.0.328.0.32Patch availableCNA
Microsoft.NET 9.0 installed on Linux9.0.0 to before 9.0.3209.0.320Patch availableCNA
Microsoft.NET 9.0 installed on Mac OS9.0.0 to before 9.0.3209.0.320Patch availableCNA
Microsoft.NET 9.0 installed on Windows9.0.0 to before 9.0.3209.0.320Patch availableCNA
Microsoft.NET 9.0 runtime9.0.0 to before 9.0.219.0.21Patch availableCNA
MicrosoftMicrosoft Visual Studio 2019 version 16.1116.11.0 to before 16.11.6116.11.61Patch availableCNA
MicrosoftMicrosoft Visual Studio 2022 version 17.1417.14.0 to before 17.14.4317.14.43Patch availableCNA
MicrosoftMicrosoft Visual Studio 2026 version 18.1018.10.0 to before 18.10.418.10.4Patch availableCNA
MicrosoftMicrosoft Visual Studio 2026 version 18.1118.11.0 to before 18.11.218.11.2Patch availableCNA
MicrosoftMicrosoft Visual Studio 2026 version 18.1218.12.0 to before 18.12 Insiders 318.12 Insiders 3Patch availableCNA
—Microsoft.NETCore.App.Runtime.win-arm64 (NuGet)8.0.0 to before 8.0.338.0.33Patch availableGHSA-4mpw-cpwj-hxxj
—Microsoft.NETCore.App.Runtime.win-x64 (NuGet)8.0.0 to before 8.0.338.0.33Patch availableGHSA-4mpw-cpwj-hxxj
—Microsoft.NETCore.App.Runtime.win-x86 (NuGet)8.0.0 to before 8.0.338.0.33Patch availableGHSA-4mpw-cpwj-hxxj
—Microsoft.NETCore.App.Runtime.win-arm64 (NuGet)11.0.0-preview.1 to before 11.0.0-rc.3.26522.14811.0.0-rc.3.26522.148Patch availableGHSA-4mpw-cpwj-hxxj
—Microsoft.NETCore.App.Runtime.win-x64 (NuGet)11.0.0-preview.1 to before 11.0.0-rc.3.26522.14811.0.0-rc.3.26522.148Patch availableGHSA-4mpw-cpwj-hxxj
—Microsoft.NETCore.App.Runtime.win-x86 (NuGet)11.0.0-preview.1 to before 11.0.0-rc.3.26522.14811.0.0-rc.3.26522.148Patch availableGHSA-4mpw-cpwj-hxxj
—Microsoft.NETCore.App.Runtime.win-arm64 (NuGet)9.0.0 to before 9.0.229.0.22Patch availableGHSA-4mpw-cpwj-hxxj
—Microsoft.NETCore.App.Runtime.win-x64 (NuGet)9.0.0 to before 9.0.229.0.22Patch availableGHSA-4mpw-cpwj-hxxj
—Microsoft.NETCore.App.Runtime.win-x86 (NuGet)9.0.0 to before 9.0.229.0.22Patch availableGHSA-4mpw-cpwj-hxxj
—Microsoft.NETCore.App.Runtime.win-arm64 (NuGet)10.0.0 to before 10.0.1410.0.14Patch availableGHSA-4mpw-cpwj-hxxj
—Microsoft.NETCore.App.Runtime.win-x64 (NuGet)10.0.0 to before 10.0.1410.0.14Patch availableGHSA-4mpw-cpwj-hxxj
—Microsoft.NETCore.App.Runtime.win-x86 (NuGet)10.0.0 to before 10.0.1410.0.14Patch availableGHSA-4mpw-cpwj-hxxj
  • .NET 10.0 installed on Linux VendorMicrosoft Affected 10.0.0 to before 10.0.403 Fixed in 10.0.403 Patch available CNA
  • .NET 10.0 installed on Mac OS VendorMicrosoft Affected 10.0.0 to before 10.0.403 Fixed in 10.0.403 Patch available CNA
  • .NET 10.0 installed on Windows VendorMicrosoft Affected 10.0.0 to before 10.0.403 Fixed in 10.0.403 Patch available CNA
  • .NET 10.0 runtime VendorMicrosoft Affected 10.0.0 to before 10.0.13 Fixed in 10.0.13 Patch available CNA
  • .NET 11.0 installed on Linux VendorMicrosoft Affected 11.0.0-preview.1 to before 11.0.100-rc.3 Fixed in 11.0.100-rc.3 Patch available CNA
  • .NET 11.0 installed on Mac OS VendorMicrosoft Affected 11.0.0-preview.1 to before 11.0.100-rc.3 Fixed in 11.0.100-rc.3 Patch available CNA
  • .NET 11.0 installed on Windows VendorMicrosoft Affected 11.0.0-preview.1 to before 11.0.100-rc.3.26522.148 Fixed in 11.0.100-rc.3.26522.148 Patch available CNA
  • .NET 11.0 runtime VendorMicrosoft Affected 11.0.0 to before 11.0.0-rc.2 Fixed in 11.0.0-rc.2 Patch available CNA
  • .NET 8.0 installed on Linux VendorMicrosoft Affected 8.0.0 to before 8.0.427 Fixed in 8.0.427 Patch available CNA
  • .NET 8.0 installed on Mac OS VendorMicrosoft Affected 8.0.0 to before 8.0.427 Fixed in 8.0.427 Patch available CNA
  • .NET 8.0 installed on Windows VendorMicrosoft Affected 8.0.0 to before 8.0.427 Fixed in 8.0.427 Patch available CNA
  • .NET 8.0 runtime VendorMicrosoft Affected 8.0.0 to before 8.0.32 Fixed in 8.0.32 Patch available CNA
  • .NET 9.0 installed on Linux VendorMicrosoft Affected 9.0.0 to before 9.0.320 Fixed in 9.0.320 Patch available CNA
  • .NET 9.0 installed on Mac OS VendorMicrosoft Affected 9.0.0 to before 9.0.320 Fixed in 9.0.320 Patch available CNA
  • .NET 9.0 installed on Windows VendorMicrosoft Affected 9.0.0 to before 9.0.320 Fixed in 9.0.320 Patch available CNA
  • .NET 9.0 runtime VendorMicrosoft Affected 9.0.0 to before 9.0.21 Fixed in 9.0.21 Patch available CNA
  • Microsoft Visual Studio 2019 version 16.11 VendorMicrosoft Affected 16.11.0 to before 16.11.61 Fixed in 16.11.61 Patch available CNA
  • Microsoft Visual Studio 2022 version 17.14 VendorMicrosoft Affected 17.14.0 to before 17.14.43 Fixed in 17.14.43 Patch available CNA
  • Microsoft Visual Studio 2026 version 18.10 VendorMicrosoft Affected 18.10.0 to before 18.10.4 Fixed in 18.10.4 Patch available CNA
  • Microsoft Visual Studio 2026 version 18.11 VendorMicrosoft Affected 18.11.0 to before 18.11.2 Fixed in 18.11.2 Patch available CNA
  • Microsoft Visual Studio 2026 version 18.12 VendorMicrosoft Affected 18.12.0 to before 18.12 Insiders 3 Fixed in 18.12 Insiders 3 Patch available CNA
  • Microsoft.NETCore.App.Runtime.win-arm64 (NuGet) Vendor— Affected 8.0.0 to before 8.0.33 Fixed in 8.0.33 Patch available GHSA-4mpw-cpwj-hxxj
  • Microsoft.NETCore.App.Runtime.win-x64 (NuGet) Vendor— Affected 8.0.0 to before 8.0.33 Fixed in 8.0.33 Patch available GHSA-4mpw-cpwj-hxxj
  • Microsoft.NETCore.App.Runtime.win-x86 (NuGet) Vendor— Affected 8.0.0 to before 8.0.33 Fixed in 8.0.33 Patch available GHSA-4mpw-cpwj-hxxj
  • Microsoft.NETCore.App.Runtime.win-arm64 (NuGet) Vendor— Affected 11.0.0-preview.1 to before 11.0.0-rc.3.26522.148 Fixed in 11.0.0-rc.3.26522.148 Patch available GHSA-4mpw-cpwj-hxxj
  • Microsoft.NETCore.App.Runtime.win-x64 (NuGet) Vendor— Affected 11.0.0-preview.1 to before 11.0.0-rc.3.26522.148 Fixed in 11.0.0-rc.3.26522.148 Patch available GHSA-4mpw-cpwj-hxxj
  • Microsoft.NETCore.App.Runtime.win-x86 (NuGet) Vendor— Affected 11.0.0-preview.1 to before 11.0.0-rc.3.26522.148 Fixed in 11.0.0-rc.3.26522.148 Patch available GHSA-4mpw-cpwj-hxxj
  • Microsoft.NETCore.App.Runtime.win-arm64 (NuGet) Vendor— Affected 9.0.0 to before 9.0.22 Fixed in 9.0.22 Patch available GHSA-4mpw-cpwj-hxxj
  • Microsoft.NETCore.App.Runtime.win-x64 (NuGet) Vendor— Affected 9.0.0 to before 9.0.22 Fixed in 9.0.22 Patch available GHSA-4mpw-cpwj-hxxj
  • Microsoft.NETCore.App.Runtime.win-x86 (NuGet) Vendor— Affected 9.0.0 to before 9.0.22 Fixed in 9.0.22 Patch available GHSA-4mpw-cpwj-hxxj
  • Microsoft.NETCore.App.Runtime.win-arm64 (NuGet) Vendor— Affected 10.0.0 to before 10.0.14 Fixed in 10.0.14 Patch available GHSA-4mpw-cpwj-hxxj
  • Microsoft.NETCore.App.Runtime.win-x64 (NuGet) Vendor— Affected 10.0.0 to before 10.0.14 Fixed in 10.0.14 Patch available GHSA-4mpw-cpwj-hxxj
  • Microsoft.NETCore.App.Runtime.win-x86 (NuGet) Vendor— Affected 10.0.0 to before 10.0.14 Fixed in 10.0.14 Patch available GHSA-4mpw-cpwj-hxxj

Remediation

Upgrade .NET 8.0 installed to 8.0.427 and the 8.0 runtime to 8.0.32, .NET 9.0 installed to 9.0.320, .NET 10.0 installed to 10.0.403 and the 10.0 runtime to 10.0.13, and .NET 11.0 to 11.0.100-rc.3 on Linux and Mac OS, 11.0.100-rc.3.26522.148 on Windows, or 11.0.0-rc.2 for the runtime. Microsoft advisories KB5133964, KB5133965, KB5133966, KB5130034, KB5130035 and KB5130036 cover these fixes. Red Hat fixes Red Hat Hardened Images in RHSA-2026:84693.

Written with Claude Haiku 5.5 from the sources below · 2026-10-27

  • Fix · GHSA-4mpw-cpwj-hxxj Microsoft.NETCore.App.Runtime.win-arm64 (NuGet) Fixed in 8.0.33 Advisory →
  • Fix · GHSA-4mpw-cpwj-hxxj Microsoft.NETCore.App.Runtime.win-x64 (NuGet) Fixed in 8.0.33 Advisory →
  • Fix · GHSA-4mpw-cpwj-hxxj Microsoft.NETCore.App.Runtime.win-x86 (NuGet) Fixed in 8.0.33 Advisory →
  • Fix · GHSA-4mpw-cpwj-hxxj Microsoft.NETCore.App.Runtime.win-arm64 (NuGet) Fixed in 11.0.0-rc.3.26522.148 Advisory →
  • Fix · GHSA-4mpw-cpwj-hxxj Microsoft.NETCore.App.Runtime.win-x64 (NuGet) Fixed in 11.0.0-rc.3.26522.148 Advisory →
  • Fix · GHSA-4mpw-cpwj-hxxj Microsoft.NETCore.App.Runtime.win-x86 (NuGet) Fixed in 11.0.0-rc.3.26522.148 Advisory →
  • Fix · GHSA-4mpw-cpwj-hxxj Microsoft.NETCore.App.Runtime.win-arm64 (NuGet) Fixed in 9.0.22 Advisory →
  • Fix · GHSA-4mpw-cpwj-hxxj Microsoft.NETCore.App.Runtime.win-x64 (NuGet) Fixed in 9.0.22 Advisory →
  • Fix · GHSA-4mpw-cpwj-hxxj Microsoft.NETCore.App.Runtime.win-x86 (NuGet) Fixed in 9.0.22 Advisory →
  • Fix · GHSA-4mpw-cpwj-hxxj Microsoft.NETCore.App.Runtime.win-arm64 (NuGet) Fixed in 10.0.14 Advisory →
  • Fix · GHSA-4mpw-cpwj-hxxj Microsoft.NETCore.App.Runtime.win-x64 (NuGet) Fixed in 10.0.14 Advisory →
  • Fix · GHSA-4mpw-cpwj-hxxj Microsoft.NETCore.App.Runtime.win-x86 (NuGet) Fixed in 10.0.14 Advisory →

Red Hat 1 advisory

  • RHSA-2026:84693 Released 2026-10-19 · Red Hat rating Important
    Red Hat Hardened Images RPMs Security Update
    • Red Hat Hardened Images aspnetcore-runtime-8.0-8.0.32-0.1.hum1@aarch64, aspnetcore-runtime-8.0-8.0.32-0.1.hum1@x86_64, aspnetcore-runtime-dbg-8.0-8.0.32-0.1.hum1@aarch64 +22

Microsoft 6 updates

  • KB5133966
    Security Update
    • .NET 10.0 installed on Linux 10.0.403
    • .NET 10.0 installed on Mac OS 10.0.403
    • .NET 10.0 installed on Windows 10.0.403
    • .NET source-build Linux tarballs (all archive types) 10.0.403-servicing.26523.112
    • Microsoft.AspNetCore.Components.WebAssembly.DevServer 10.0.14
    • Microsoft.AspNetCore.Components.WebAssembly.Server 10.0.14
  • KB5133965
    Security Update
    • .NET 9.0 installed on Linux 9.0.320
    • .NET 9.0 installed on Mac OS 9.0.320
    • .NET 9.0 installed on Windows 9.0.320
    • ASP.NET Core runtime and targeting-pack Linux tarballs (Microsoft-published) 9.0.22
  • KB5133964
    Security Update
    • .NET 8.0 installed on Linux 8.0.427
    • .NET 8.0 installed on Mac OS 8.0.427
    • .NET 8.0 installed on Windows 8.0.427
Show 3 more Microsoft updates
  • KB5130036
    Security Update
    • .NET 10.0 installed on Windows 10.0.13
    • .NET 10.0 runtime installed on Linux 10.0.13
    • .NET 10.0 runtime installed on Mac OS 10.0.13
    • .NET 10.0 runtime installed on Windows 10.0.13, 10.0.402
  • KB5130035
    Security Update
    • .NET 9.0 installed on Windows 9.0.21
    • .NET 9.0 runtime installed on Linux 9.0.21
    • .NET 9.0 runtime installed on Mac OS 9.0.21
    • .NET 9.0 runtime installed on Windows 9.0.21, 9.0.319, 9.0.122
  • KB5130034
    Security Update
    • .NET 8.0 installed on Windows 8.0.32
    • .NET 8.0 runtime installed on Linux 8.0.32
    • .NET 8.0 runtime installed on Mac OS 8.0.32
    • .NET 8.0 runtime installed on Windows 8.0.32

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Hardened ImagesFixed RHSA-2026:84693
Not affected: 1 product
  • Red Hat Hardened Images

Microsoft

Microsoft's page for this CVE →

Impact
Remote Code Execution
Exploited
No
Publicly disclosed
No
Exploitability
Exploitation Less Likely
ProductStatusPlan or fix
.NET 11.0 installed on LinuxFixed 11.0.100-rc.3 · Security Update
.NET 11.0 installed on Mac OSFixed 11.0.100-rc.3 · Security Update
.NET 11.0 installed on WindowsFixed 11.0.100-rc.3.26522.148 · Security Update
.NET 11.0 runtime installed on WindowsFixed 11.0.0-rc.2 · Security Update
Microsoft Visual Studio 2019 version 16.11Fixed 16.11.61 · Security Update
Microsoft Visual Studio 2022 version 17.14Fixed 17.14.43 · Security Update
Microsoft Visual Studio 2026 version 18.10Fixed 18.10.4 · Security Update
Microsoft Visual Studio 2026 version 18.11Fixed 18.11.2 · Security Update
Microsoft Visual Studio 2026 version 18.12Fixed 18.12 Insiders 3 · Security Update

Timeline

  1. 2026-10-13 Threatist record created from CVE-2026-70197
  2. 2026-10-13 Alias added: GHSA-4mpw-cpwj-hxxj
  3. 2026-10-13 Fix available: NuGet/[email protected], NuGet/[email protected], NuGet/[email protected] +9 · GHSA-4mpw-cpwj-hxxj
  4. 2026-10-13 CVSS score added · GHSA-4mpw-cpwj-hxxj
  5. 2026-10-13 Weakness changed · GHSA-4mpw-cpwj-hxxj
  6. 2026-10-13 4 new references · GHSA-4mpw-cpwj-hxxj
  7. 2026-10-13 CISA SSVC decision points changed
  8. 2026-10-14 Priority changed: MEDIUM → LOW
  9. 2026-10-14 CISA SSVC decision points changed
  10. 2026-10-16 Fix available: KB5130034, KB5130035, KB5130036 · Microsoft
  11. 2026-10-18 Affected versions changed · Red Hat
  12. 2026-10-20 2 new references · GHSA-4mpw-cpwj-hxxj
  13. 2026-10-20 Fix available: RHSA-2026:84693 · Red Hat
  14. 2026-10-20 Fix available: Red Hat Hardened Images · Red Hat
  15. 2026-10-23 Fix available: Microsoft/.NET 10.0 [email protected], Microsoft/.NET 11.0 [email protected], Microsoft/.NET 8.0 [email protected] +1 · CNA
  16. 2026-10-25 Title updated · CNA
  17. 2026-10-25 Fix available: Microsoft/.NET 10.0 installed on [email protected], Microsoft/.NET 10.0 installed on Mac [email protected], Microsoft/.NET 10.0 installed on [email protected] +13 · CNA
  18. 2026-10-25 Fix available: KB5133964, KB5133965, KB5133966 · Microsoft
  19. 2026-11-03 Fix available: NuGet/[email protected], NuGet/[email protected], NuGet/[email protected] +9 · GHSA-4mpw-cpwj-hxxj
  20. 2026-11-03 2 new references · GHSA-4mpw-cpwj-hxxj

References

Patch 1

Advisory 1

Other 6

  • TI-2026-42212 Microsoft SharePoint Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-37256 Microsoft SharePoint Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-26194 Windows Internet Key Exchange (IKE) Service Extensions Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-16982 Microsoft SharePoint Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-36863 Windows Server Update Service (WSUS) Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-33671 Microsoft SharePoint Server Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
See all 18045 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences