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TI-2026-72396 Aliases CVE-2026-83520GHSA-4w5f-7jp2-w48g

Untrusted data deserialization in .NET allows remote code execution

Priority MEDIUM 43CWE-502Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
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 and Red Hat. Impact type from CWE-502.

Summary

The .NET 8.0, 9.0, 10.0 and 11.0 runtimes, several Microsoft .NET Framework versions, and Visual Studio 2022 version 17.14 and 2026 version 18.10 are affected. Deserialization of untrusted data (CWE-502) lets an unauthorized attacker over a network execute code, and a user must interact to trigger it.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

Deserialization of untrusted data 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 0.01435 73rd percentileScored 2026-11-07
Fix Fixed .NET 10.0 runtime (Microsoft): 10.0.13.NET 11.0 runtime (Microsoft): 11.0.0-rc.2+15 more productsRed Hat: 1 advisory

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 runtime10.0.0 to before 10.0.1310.0.13Patch availableCNA
Microsoft.NET 11.0 runtime11.0.0 to before 11.0.0-rc.211.0.0-rc.2Patch availableCNA
Microsoft.NET 8.0 runtime8.0.0 to before 8.0.328.0.32Patch availableCNA
Microsoft.NET 9.0 runtime9.0.0 to before 9.0.219.0.21Patch availableCNA
MicrosoftMicrosoft .NET Framework 3.53.5.0 to before 2.0.50727.9188 AND 3.0.30729.91712.0.50727.9188 AND 3.0.30729.9171Patch availableCNA
MicrosoftMicrosoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.23.0.0.0 to before 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.02.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0Patch availableCNA
MicrosoftMicrosoft .NET Framework 3.5 AND 4.7.24.7.0 to before 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.02.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0Patch availableCNA
MicrosoftMicrosoft .NET Framework 3.5 AND 4.84.8.0 to before 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.02.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0Patch availableCNA
MicrosoftMicrosoft .NET Framework 3.5 AND 4.8.14.8.1 to before 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.02.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0Patch availableCNA
MicrosoftMicrosoft .NET Framework 4.6.2/4.7/4.7.1/4.7.24.7.0 to before 4.7.4150.04.7.4150.0Patch availableCNA
MicrosoftMicrosoft .NET Framework 4.84.8.0 to before 4.8.4811.04.8.4811.0Patch availableCNA
MicrosoftMicrosoft .NET Framework 4.8.14.8.0.0 to before 4.8.9363.04.8.9363.0Patch availableCNA
MicrosoftMicrosoft Visual Studio 2022 version 17.1417.14.0 to before 17.14.4217.14.42Patch availableCNA
MicrosoftMicrosoft Visual Studio 2026 version 18.1018.10.0 to before 18.10.418.10.4Patch availableCNA
—Microsoft.WindowsDesktop.App.Runtime.win-arm64 (NuGet)11.0.0-preview.1 to before 11.0.0-rc.211.0.0-rc.2Patch availableGHSA-4w5f-7jp2-w48g
—Microsoft.WindowsDesktop.App.Runtime.win-x64 (NuGet)11.0.0-preview.1 to before 11.0.0-rc.211.0.0-rc.2Patch availableGHSA-4w5f-7jp2-w48g
—Microsoft.WindowsDesktop.App.Runtime.win-x86 (NuGet)11.0.0-preview.1 to before 11.0.0-rc.211.0.0-rc.2Patch availableGHSA-4w5f-7jp2-w48g
—Microsoft.WindowsDesktop.App.Runtime.win-arm64 (NuGet)10.0.0 to before 10.0.1310.0.13Patch availableGHSA-4w5f-7jp2-w48g
—Microsoft.WindowsDesktop.App.Runtime.win-x64 (NuGet)10.0.0 to before 10.0.1310.0.13Patch availableGHSA-4w5f-7jp2-w48g
—Microsoft.WindowsDesktop.App.Runtime.win-x86 (NuGet)10.0.0 to before 10.0.1310.0.13Patch availableGHSA-4w5f-7jp2-w48g
—Microsoft.WindowsDesktop.App.Runtime.win-arm64 (NuGet)8.0.0 to before 8.0.328.0.32Patch availableGHSA-4w5f-7jp2-w48g
—Microsoft.WindowsDesktop.App.Runtime.win-x64 (NuGet)8.0.0 to before 8.0.328.0.32Patch availableGHSA-4w5f-7jp2-w48g
—Microsoft.WindowsDesktop.App.Runtime.win-x86 (NuGet)8.0.0 to before 8.0.328.0.32Patch availableGHSA-4w5f-7jp2-w48g
—Microsoft.WindowsDesktop.App.Runtime.win-arm64 (NuGet)9.0.0 to before 9.0.219.0.21Patch availableGHSA-4w5f-7jp2-w48g
—Microsoft.WindowsDesktop.App.Runtime.win-x64 (NuGet)9.0.0 to before 9.0.219.0.21Patch availableGHSA-4w5f-7jp2-w48g
—Microsoft.WindowsDesktop.App.Runtime.win-x86 (NuGet)9.0.0 to before 9.0.219.0.21Patch availableGHSA-4w5f-7jp2-w48g
  • .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 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 runtime VendorMicrosoft Affected 8.0.0 to before 8.0.32 Fixed in 8.0.32 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 .NET Framework 3.5 VendorMicrosoft Affected 3.5.0 to before 2.0.50727.9188 AND 3.0.30729.9171 Fixed in 2.0.50727.9188 AND 3.0.30729.9171 Patch available CNA
  • Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 VendorMicrosoft Affected 3.0.0.0 to before 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0 Fixed in 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0 Patch available CNA
  • Microsoft .NET Framework 3.5 AND 4.7.2 VendorMicrosoft Affected 4.7.0 to before 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0 Fixed in 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0 Patch available CNA
  • Microsoft .NET Framework 3.5 AND 4.8 VendorMicrosoft Affected 4.8.0 to before 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0 Fixed in 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0 Patch available CNA
  • Microsoft .NET Framework 3.5 AND 4.8.1 VendorMicrosoft Affected 4.8.1 to before 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0 Fixed in 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0 Patch available CNA
  • Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 VendorMicrosoft Affected 4.7.0 to before 4.7.4150.0 Fixed in 4.7.4150.0 Patch available CNA
  • Microsoft .NET Framework 4.8 VendorMicrosoft Affected 4.8.0 to before 4.8.4811.0 Fixed in 4.8.4811.0 Patch available CNA
  • Microsoft .NET Framework 4.8.1 VendorMicrosoft Affected 4.8.0.0 to before 4.8.9363.0 Fixed in 4.8.9363.0 Patch available CNA
  • Microsoft Visual Studio 2022 version 17.14 VendorMicrosoft Affected 17.14.0 to before 17.14.42 Fixed in 17.14.42 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.WindowsDesktop.App.Runtime.win-arm64 (NuGet) Vendor— Affected 11.0.0-preview.1 to before 11.0.0-rc.2 Fixed in 11.0.0-rc.2 Patch available GHSA-4w5f-7jp2-w48g
  • Microsoft.WindowsDesktop.App.Runtime.win-x64 (NuGet) Vendor— Affected 11.0.0-preview.1 to before 11.0.0-rc.2 Fixed in 11.0.0-rc.2 Patch available GHSA-4w5f-7jp2-w48g
  • Microsoft.WindowsDesktop.App.Runtime.win-x86 (NuGet) Vendor— Affected 11.0.0-preview.1 to before 11.0.0-rc.2 Fixed in 11.0.0-rc.2 Patch available GHSA-4w5f-7jp2-w48g
  • Microsoft.WindowsDesktop.App.Runtime.win-arm64 (NuGet) Vendor— Affected 10.0.0 to before 10.0.13 Fixed in 10.0.13 Patch available GHSA-4w5f-7jp2-w48g
  • Microsoft.WindowsDesktop.App.Runtime.win-x64 (NuGet) Vendor— Affected 10.0.0 to before 10.0.13 Fixed in 10.0.13 Patch available GHSA-4w5f-7jp2-w48g
  • Microsoft.WindowsDesktop.App.Runtime.win-x86 (NuGet) Vendor— Affected 10.0.0 to before 10.0.13 Fixed in 10.0.13 Patch available GHSA-4w5f-7jp2-w48g
  • Microsoft.WindowsDesktop.App.Runtime.win-arm64 (NuGet) Vendor— Affected 8.0.0 to before 8.0.32 Fixed in 8.0.32 Patch available GHSA-4w5f-7jp2-w48g
  • Microsoft.WindowsDesktop.App.Runtime.win-x64 (NuGet) Vendor— Affected 8.0.0 to before 8.0.32 Fixed in 8.0.32 Patch available GHSA-4w5f-7jp2-w48g
  • Microsoft.WindowsDesktop.App.Runtime.win-x86 (NuGet) Vendor— Affected 8.0.0 to before 8.0.32 Fixed in 8.0.32 Patch available GHSA-4w5f-7jp2-w48g
  • Microsoft.WindowsDesktop.App.Runtime.win-arm64 (NuGet) Vendor— Affected 9.0.0 to before 9.0.21 Fixed in 9.0.21 Patch available GHSA-4w5f-7jp2-w48g
  • Microsoft.WindowsDesktop.App.Runtime.win-x64 (NuGet) Vendor— Affected 9.0.0 to before 9.0.21 Fixed in 9.0.21 Patch available GHSA-4w5f-7jp2-w48g
  • Microsoft.WindowsDesktop.App.Runtime.win-x86 (NuGet) Vendor— Affected 9.0.0 to before 9.0.21 Fixed in 9.0.21 Patch available GHSA-4w5f-7jp2-w48g

Remediation

Fixed versions are .NET 8.0.32, 9.0.21, 10.0.13 and 11.0.0-rc.2, Visual Studio 2022 17.14.42 and 2026 18.10.4, and .NET Framework 4.7.4150.0, 4.8.4811.0 and 4.8.9363.0. Red Hat fixes Red Hat Hardened Images in RHSA-2026:84693.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA .NET 10.0 runtime (Microsoft) Fixed in 10.0.13
  • Fix · CNA .NET 11.0 runtime (Microsoft) Fixed in 11.0.0-rc.2
  • Fix · CNA .NET 8.0 runtime (Microsoft) Fixed in 8.0.32
  • Fix · CNA .NET 9.0 runtime (Microsoft) Fixed in 9.0.21
  • Fix · CNA Microsoft .NET Framework 3.5 (Microsoft) Fixed in 2.0.50727.9188 AND 3.0.30729.9171
  • Fix · CNA Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 (Microsoft) Fixed in 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0
  • Fix · CNA Microsoft .NET Framework 3.5 AND 4.7.2 (Microsoft) Fixed in 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0
  • Fix · CNA Microsoft .NET Framework 3.5 AND 4.8 (Microsoft) Fixed in 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0
  • Fix · CNA Microsoft .NET Framework 3.5 AND 4.8.1 (Microsoft) Fixed in 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0
  • Fix · CNA Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 (Microsoft) Fixed in 4.7.4150.0
  • Fix · CNA Microsoft .NET Framework 4.8 (Microsoft) Fixed in 4.8.4811.0
  • Fix · CNA Microsoft .NET Framework 4.8.1 (Microsoft) Fixed in 4.8.9363.0
  • Fix · CNA Microsoft Visual Studio 2022 version 17.14 (Microsoft) Fixed in 17.14.42
  • Fix · CNA Microsoft Visual Studio 2026 version 18.10 (Microsoft) Fixed in 18.10.4
  • Fix · GHSA-4w5f-7jp2-w48g Microsoft.WindowsDesktop.App.Runtime.win-arm64 (NuGet) Fixed in 11.0.0-rc.2 Advisory →
  • Fix · GHSA-4w5f-7jp2-w48g Microsoft.WindowsDesktop.App.Runtime.win-x64 (NuGet) Fixed in 11.0.0-rc.2 Advisory →
  • Fix · GHSA-4w5f-7jp2-w48g Microsoft.WindowsDesktop.App.Runtime.win-x86 (NuGet) Fixed in 11.0.0-rc.2 Advisory →
  • Fix · GHSA-4w5f-7jp2-w48g Microsoft.WindowsDesktop.App.Runtime.win-arm64 (NuGet) Fixed in 10.0.13 Advisory →
  • Fix · GHSA-4w5f-7jp2-w48g Microsoft.WindowsDesktop.App.Runtime.win-x64 (NuGet) Fixed in 10.0.13 Advisory →
  • Fix · GHSA-4w5f-7jp2-w48g Microsoft.WindowsDesktop.App.Runtime.win-x86 (NuGet) Fixed in 10.0.13 Advisory →
  • Fix · GHSA-4w5f-7jp2-w48g Microsoft.WindowsDesktop.App.Runtime.win-arm64 (NuGet) Fixed in 8.0.32 Advisory →
  • Fix · GHSA-4w5f-7jp2-w48g Microsoft.WindowsDesktop.App.Runtime.win-x64 (NuGet) Fixed in 8.0.32 Advisory →
  • Fix · GHSA-4w5f-7jp2-w48g Microsoft.WindowsDesktop.App.Runtime.win-x86 (NuGet) Fixed in 8.0.32 Advisory →
  • Fix · GHSA-4w5f-7jp2-w48g Microsoft.WindowsDesktop.App.Runtime.win-arm64 (NuGet) Fixed in 9.0.21 Advisory →
  • Fix · GHSA-4w5f-7jp2-w48g Microsoft.WindowsDesktop.App.Runtime.win-x64 (NuGet) Fixed in 9.0.21 Advisory →
  • Fix · GHSA-4w5f-7jp2-w48g Microsoft.WindowsDesktop.App.Runtime.win-x86 (NuGet) Fixed in 9.0.21 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

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

Timeline

  1. 2026-10-13 Threatist record created from CVE-2026-83520
  2. 2026-10-13 Alias added: GHSA-4w5f-7jp2-w48g
  3. 2026-10-13 Fix available: NuGet/[email protected], NuGet/[email protected], NuGet/[email protected] +9 · GHSA-4w5f-7jp2-w48g
  4. 2026-10-13 CVSS score added · GHSA-4w5f-7jp2-w48g
  5. 2026-10-13 Weakness changed · GHSA-4w5f-7jp2-w48g
  6. 2026-10-13 4 new references · GHSA-4w5f-7jp2-w48g
  7. 2026-10-14 CISA SSVC decision points changed
  8. 2026-10-14 Priority changed: LOW → MEDIUM
  9. 2026-10-18 Affected versions changed · Red Hat
  10. 2026-10-20 2 new references · GHSA-4w5f-7jp2-w48g
  11. 2026-10-20 Fix available: RHSA-2026:84693 · Red Hat
  12. 2026-10-20 Fix available: Red Hat Hardened Images · Red Hat
  13. 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

References

Patch 1

Advisory 1

Other 4

  • 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