MSRC-CVE-2026-70194 — .NET Framework Security Feature Bypass Vulnerability

Summary

Impact: Security Feature Bypass. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.

Details

What kind of security feature could be bypassed by successfully exploiting this vulnerability?
An attacker who successfully exploited this vulnerability could bypass certificate validation mechanisms and provide arbitrary certificates that do not have proper signatures.

Security updates
18.10.4 — https://learn.microsoft.com/en-us/visualstudio/releases/2026/release-notes
17.14.42 — https://learn.microsoft.com/en-us/visualstudio/releases/2022/release-notes
11.0.0-rc.2 — https://github.com/dotnet/announcements/issues/464

Vulnerabilities 1

Medium 6.5

CVE-2026-70194

.NET Framework Security Feature Bypass Vulnerability

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

Microsoft Microsoft Visual Studio 2022 version 17.14 Microsoft Visual Studio 2026 version 18.10 .NET 11.0 runtime Ubuntu NuGet

Oct 13, 2026

Revision history

2026-10-13 #1
Information published.

References

CVE-2026-70194 .NET Framework Security Feature Bypass Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70194
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
Common Vulnerability Scoring System
https://www.first.org/cvss