---
id: CVE-2026-70194
title: >-
  Improper certificate validation in .NET Framework allows an unauthorized
  attacker to bypass a security feature over a network.
summary: >-
  Improper certificate validation in .NET Framework allows an unauthorized
  attacker to bypass a security feature over a network.
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N'
cwe:
  - CWE-295
published: '2026-10-13'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T19:17:19.530'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-70194'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70194'
    label: secure@microsoft.com
  - url: 'https://github.com/dotnet/runtime/security/advisories/GHSA-fqpq-cx42-9jmm'
  - url: 'https://github.com/dotnet/announcements/issues/464'
  - url: 'https://github.com/dotnet/runtime/issues/135701'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-70194'
  - url: 'https://github.com/advisories/GHSA-fqpq-cx42-9jmm'
tags:
  - nvd
  - cve.org
  - ghsa
  - nuget
epss: 0.00486
epssPercentile: 0.41664
ingestedAt: '2026-10-13T19:43:29.023Z'
vendor: Microsoft
product: .NET 11.0
affected:
  - .net_11.0 >= 11.0.0 < 11.0.0-rc.2
  - visual_studio_2022_version_17.14 >= 17.14.0 < 17.14.42
  - visual_studio_2026_version_18.10 >= 18.10.0 < 18.10.4
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-14T18:46:03.417201Z'
aliases:
  - GHSA-fqpq-cx42-9jmm
ecosystem: nuget
patched:
  - Microsoft.NETCore.App.Runtime.linux-arm 11.0.0-rc.2
  - Microsoft.NETCore.App.Runtime.linux-arm64 11.0.0-rc.2
  - Microsoft.NETCore.App.Runtime.linux-musl-arm 11.0.0-rc.2
  - Microsoft.NETCore.App.Runtime.linux-musl-arm64 11.0.0-rc.2
  - Microsoft.NETCore.App.Runtime.linux-musl-x64 11.0.0-rc.2
  - Microsoft.NETCore.App.Runtime.linux-x64 11.0.0-rc.2
  - Microsoft.NETCore.App.Runtime.osx-arm64 11.0.0-rc.2
  - Microsoft.NETCore.App.Runtime.osx-x64 11.0.0-rc.2
---

## Overview

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

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-70194)

Affected packages:

- `Microsoft.NETCore.App.Runtime.linux-arm >= 11.0.0-preview.1, <= 11.0.0-rc.1`
- `Microsoft.NETCore.App.Runtime.linux-arm64 >= 11.0.0-preview.1, <= 11.0.0-rc.1`
- `Microsoft.NETCore.App.Runtime.linux-musl-arm >= 11.0.0-preview.1, <= 11.0.0-rc.1`
- `Microsoft.NETCore.App.Runtime.linux-musl-arm64 >= 11.0.0-preview.1, <= 11.0.0-rc.1`
- `Microsoft.NETCore.App.Runtime.linux-musl-x64 >= 11.0.0-preview.1, <= 11.0.0-rc.1`
- `Microsoft.NETCore.App.Runtime.linux-x64 >= 11.0.0-preview.1, <= 11.0.0-rc.1`
- `Microsoft.NETCore.App.Runtime.osx-arm64 >= 11.0.0-preview.1, <= 11.0.0-rc.1`
- `Microsoft.NETCore.App.Runtime.osx-x64 >= 11.0.0-preview.1, <= 11.0.0-rc.1`

Patched in:

- `Microsoft.NETCore.App.Runtime.linux-arm 11.0.0-rc.2`
- `Microsoft.NETCore.App.Runtime.linux-arm64 11.0.0-rc.2`
- `Microsoft.NETCore.App.Runtime.linux-musl-arm 11.0.0-rc.2`
- `Microsoft.NETCore.App.Runtime.linux-musl-arm64 11.0.0-rc.2`
- `Microsoft.NETCore.App.Runtime.linux-musl-x64 11.0.0-rc.2`
- `Microsoft.NETCore.App.Runtime.linux-x64 11.0.0-rc.2`
- `Microsoft.NETCore.App.Runtime.osx-arm64 11.0.0-rc.2`
- `Microsoft.NETCore.App.Runtime.osx-x64 11.0.0-rc.2`

Source: https://github.com/advisories/GHSA-fqpq-cx42-9jmm