Read the docs
TI-2026-72266 Aliases CVE-2026-70194GHSA-fqpq-cx42-9jmm

.NET Framework Security Feature Bypass via Improper Certificate Validation

Priority LOW 35CWE-295Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Spoofing
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-295.

Summary

Improper certificate validation (CWE-295) in .NET Framework lets an unauthorized attacker on the network bypass a security feature. Microsoft rates the flaw CVSS 3.1 6.5 (Medium), with a vector of AV:N/AC:L/PR:N/UI:N and partial confidentiality and integrity impact, and no availability impact. CISA's SSVC marks it as automatable with partial technical impact and no known exploitation, and it is not in CISA KEV. Red Hat rates it Moderate.

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

Description from the CNA

Improper certificate validation in .NET Framework allows an unauthorized attacker to bypass a security feature over a network.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00486 42nd percentileScored 2026-11-07
Fix Fixed .NET 11.0 runtime (Microsoft): 11.0.0-rc.2Microsoft Visual Studio 2022 version 17.14 (Microsoft): 17.14.42+9 more products

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

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 11.0 runtime11.0.0 to before 11.0.0-rc.211.0.0-rc.2Patch 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.NETCore.App.Runtime.linux-arm (NuGet)11.0.0-preview.1 to before 11.0.0-rc.211.0.0-rc.2Patch availableGHSA-fqpq-cx42-9jmm
—Microsoft.NETCore.App.Runtime.linux-arm64 (NuGet)11.0.0-preview.1 to before 11.0.0-rc.211.0.0-rc.2Patch availableGHSA-fqpq-cx42-9jmm
—Microsoft.NETCore.App.Runtime.linux-musl-arm (NuGet)11.0.0-preview.1 to before 11.0.0-rc.211.0.0-rc.2Patch availableGHSA-fqpq-cx42-9jmm
—Microsoft.NETCore.App.Runtime.linux-musl-arm64 (NuGet)11.0.0-preview.1 to before 11.0.0-rc.211.0.0-rc.2Patch availableGHSA-fqpq-cx42-9jmm
—Microsoft.NETCore.App.Runtime.linux-musl-x64 (NuGet)11.0.0-preview.1 to before 11.0.0-rc.211.0.0-rc.2Patch availableGHSA-fqpq-cx42-9jmm
—Microsoft.NETCore.App.Runtime.linux-x64 (NuGet)11.0.0-preview.1 to before 11.0.0-rc.211.0.0-rc.2Patch availableGHSA-fqpq-cx42-9jmm
—Microsoft.NETCore.App.Runtime.osx-arm64 (NuGet)11.0.0-preview.1 to before 11.0.0-rc.211.0.0-rc.2Patch availableGHSA-fqpq-cx42-9jmm
—Microsoft.NETCore.App.Runtime.osx-x64 (NuGet)11.0.0-preview.1 to before 11.0.0-rc.211.0.0-rc.2Patch availableGHSA-fqpq-cx42-9jmm
  • .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
  • 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.NETCore.App.Runtime.linux-arm (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-fqpq-cx42-9jmm
  • Microsoft.NETCore.App.Runtime.linux-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-fqpq-cx42-9jmm
  • Microsoft.NETCore.App.Runtime.linux-musl-arm (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-fqpq-cx42-9jmm
  • Microsoft.NETCore.App.Runtime.linux-musl-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-fqpq-cx42-9jmm
  • Microsoft.NETCore.App.Runtime.linux-musl-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-fqpq-cx42-9jmm
  • Microsoft.NETCore.App.Runtime.linux-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-fqpq-cx42-9jmm
  • Microsoft.NETCore.App.Runtime.osx-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-fqpq-cx42-9jmm
  • Microsoft.NETCore.App.Runtime.osx-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-fqpq-cx42-9jmm

Remediation

Install the fixed versions: .NET 11.0.0-rc.2 for the .NET 11.0 runtime and the Microsoft.NETCore.App.Runtime packages, Visual Studio 2022 version 17.14 build 17.14.42, and Visual Studio 2026 version 18.10 build 18.10.4. Affected installs are those before these versions.

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

  • Fix · CNA .NET 11.0 runtime (Microsoft) Fixed in 11.0.0-rc.2
  • 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-fqpq-cx42-9jmm Microsoft.NETCore.App.Runtime.linux-arm (NuGet) Fixed in 11.0.0-rc.2 Advisory →
  • Fix · GHSA-fqpq-cx42-9jmm Microsoft.NETCore.App.Runtime.linux-arm64 (NuGet) Fixed in 11.0.0-rc.2 Advisory →
  • Fix · GHSA-fqpq-cx42-9jmm Microsoft.NETCore.App.Runtime.linux-musl-arm (NuGet) Fixed in 11.0.0-rc.2 Advisory →
  • Fix · GHSA-fqpq-cx42-9jmm Microsoft.NETCore.App.Runtime.linux-musl-arm64 (NuGet) Fixed in 11.0.0-rc.2 Advisory →
  • Fix · GHSA-fqpq-cx42-9jmm Microsoft.NETCore.App.Runtime.linux-musl-x64 (NuGet) Fixed in 11.0.0-rc.2 Advisory →
  • Fix · GHSA-fqpq-cx42-9jmm Microsoft.NETCore.App.Runtime.linux-x64 (NuGet) Fixed in 11.0.0-rc.2 Advisory →
  • Fix · GHSA-fqpq-cx42-9jmm Microsoft.NETCore.App.Runtime.osx-arm64 (NuGet) Fixed in 11.0.0-rc.2 Advisory →
  • Fix · GHSA-fqpq-cx42-9jmm Microsoft.NETCore.App.Runtime.osx-x64 (NuGet) Fixed in 11.0.0-rc.2 Advisory →

Vendor assessments

Red Hat

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

Not affected: 1 product
  • Red Hat Hardened Images

Timeline

  1. 2026-10-13 Threatist record created from CVE-2026-70194
  2. 2026-10-13 Alias added: GHSA-fqpq-cx42-9jmm
  3. 2026-10-13 Fix available: NuGet/[email protected], NuGet/[email protected], NuGet/[email protected] +5 · GHSA-fqpq-cx42-9jmm
  4. 2026-10-13 CVSS score added · GHSA-fqpq-cx42-9jmm
  5. 2026-10-13 Weakness changed · GHSA-fqpq-cx42-9jmm
  6. 2026-10-13 4 new references · GHSA-fqpq-cx42-9jmm
  7. 2026-10-14 Priority changed: MEDIUM → LOW
  8. 2026-10-15 CISA SSVC decision points changed
  9. 2026-10-16 Affected versions changed · Red Hat
  10. 2026-10-16 CVSS score added · Red Hat
  11. 2026-10-19 2 new references · GHSA-fqpq-cx42-9jmm
  12. 2026-10-23 Fix available: Microsoft/.NET 11.0 [email protected] · 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