NES for .NET 6: Secure, Supported, and Maintained by HeroDevs
What You Need to Know About NES for .NET 6
.NET 6 has officially reached its end of life (EOL) and no longer receives security patches or updates from Microsoft. However, many organizations still rely on .NET 6 and need a secure, compliant solution.
Enter NES for .NET
NES for .NET 6 is a HeroDevs-supported release of .NET 6 that provides ongoing security updates, vulnerability patches, and long-term support—ensuring your applications remain secure, compliant, and functional.
IMPORTANT
Please be aware that any CVEs reported by HeroDevs concerning .NET are specifically addressed and fixed in HeroDev's exclusive release of .NET, called NES for .NET.
These security updates are independently developed and supported by HeroDevs and are not supported by Microsoft.
Microsoft does not report on, patch, or offer fixes for CVEs on EOL versions of .NET, including .NET 6. Users looking for continued security updates for .NET 6 are encouraged to transition to NES for .NET 6, maintained and supported by HeroDevs.
These security updates are independently developed and supported by HeroDevs and are not supported by Microsoft.
Microsoft does not report on, patch, or offer fixes for CVEs on EOL versions of .NET, including .NET 6. Users looking for continued security updates for .NET 6 are encouraged to transition to NES for .NET 6, maintained and supported by HeroDevs.
Trusted By Global Leaders
Our Commitment to the .NET Community
At HeroDevs, we recognize and appreciate Microsoft’s leadership in creating and maintaining the .NET ecosystem. Their investment in open-source development has fostered a vibrant community of developers, businesses, and contributors.
As part of this ecosystem, HeroDevs is proud to be the first .NET partner offering post-EOL support—ensuring that businesses relying on .NET 6 can continue to operate securely and efficiently without the risk of running outdated software.
As part of this ecosystem, HeroDevs is proud to be the first .NET partner offering post-EOL support—ensuring that businesses relying on .NET 6 can continue to operate securely and efficiently without the risk of running outdated software.
CVE Protection
Addressing Security Vulnerabilities in .NET 6
HeroDevs actively monitors and addresses vulnerabilities affecting .NET 6, including CVEs identified after Microsoft's official support ended.
Organizations using NES for .NET 6 benefit from:
Proactive security updates to prevent exploits
Immediate fixes for newly discovered vulnerabilities
Compliance assurance to meet Industry regulations
Severity
ID
Technology
Libraries Affected
Category
Version(s) Affected
Published Date
Low
.NET
.NET SDK
Insufficient Verification of Data Authenticity
.NET SDK >= 6.0.0 <= 6.0.41
Jul 29, 2026
High
.NET
.NET
Remote Code Execution
Microsoft.WindowsDesktop.App >= 6.0.0 <= 6.0.43
Aug 13, 2026
Medium
.NET
.NET
Incorrectly Configured Access Control
Microsoft.NETCore.App >= 6.0.0 <= 6.0.43
Aug 13, 2026
Medium
.NET
.NET
Server-Side Request Forgery
Protection Mechanism Failure
Information Disclosure
Microsoft.WindowsDesktop.App >= 6.0.0 <= 6.0.43
Aug 13, 2026
High
.NET
.NET
Unchecked Input for Loop Condition
Denial of Service
Microsoft.NETCore.App >= 6.0.0 <= 6.0.43
Aug 13, 2026
Medium
.NET
.NET
Inconsistent Interpretation of HTTP Requests
Microsoft.NETCore.App >= 6.0.0 <= 6.0.43
Aug 13, 2026
High
.NET
.NET
Integer Overflow or Wraparound
Remote Code Execution
Microsoft.WindowsDesktop.App >= 6.0.0 <= 6.0.43
Aug 13, 2026
High
.NET
.NET
Integer Overflow or Wraparound
Heap-based Buffer Overflow
Microsoft.WindowsDesktop.App >= 6.0.0 <= 6.0.43
Aug 13, 2026
High
.NET
.NET
Heap-based Buffer Overflow
Microsoft.WindowsDesktop.App >= 6.0.0 <= 6.0.43
Aug 13, 2026
High
.NET
.NET
Access of Resource Using Incompatible Type ('Type Confusion')
>= 6.0.0 <= 6.0.42
Aug 3, 2026
High
.NET
.NET
Allocation of Resources Without Limits or Throttling
>= 6.0.0 <= 6.0.42
Aug 3, 2026
High
.NET
.NET (Windows Presentation Foundation)
Improper Control of Generation of Code ('Code Injection')
>= 6.0.0 <= 6.0.42
Aug 3, 2026
High
.NET
.NET (Windows Presentation Foundation)
Deserialization of Untrusted Data
>= 6.0.0 <= 6.0.42
Aug 3, 2026
High
.NET
.NET
Allocation of Resources Without Limits or Throttling
System.Security.Cryptography.Xml >= 6.0.0 <= 6.0.2
Aug 3, 2026
High
.NET
.NET (Windows Presentation Foundation)
Protection Mechanism Failure
>= 6.0.0 <= 6.0.42
Aug 3, 2026
High
.NET
.NET
Stack-based Buffer Overflow
System.Security.Cryptography.Xml >= 6.0.0 <= 6.0.2
Aug 3, 2026
High
.NET
.NET
Allocation of Resources Without Limits or Throttling
System.Security.Cryptography.Xml >= 6.0.0 <= 6.0.2
Aug 3, 2026
Medium
.NET
MessagePack-CSharp
Inefficient Algorithmic Complexity
MessagePack < 2.5.301; MessagePack >= 3.0 < 3.1.7; NES Essentials Plus MessagePack 2.5.192.x before 2.5.192.3
Jul 29, 2026
Medium
.NET
MessagePack-CSharp
Allocation of Resources Without Limits or Throttling
MessagePack < 2.5.301; MessagePack >= 3.0 < 3.1.7; NES Essentials Plus MessagePack 2.5.192.x before 2.5.192.3
Jul 29, 2026
Medium
.NET
MessagePack-CSharp
Allocation of Resources Without Limits or Throttling
MessagePack < 2.5.301; MessagePack >= 3.0 < 3.1.7; NES Essentials Plus MessagePack 2.5.192.x before 2.5.192.3
Jul 29, 2026
Medium
.NET
MessagePack-CSharp
Uncontrolled Recursion
MessagePack < 2.5.301; MessagePack >= 3.0 < 3.1.7; NES Essentials Plus MessagePack 2.5.192.x before 2.5.192.3
Jul 29, 2026
Medium
.NET
MessagePack-CSharp
Uncontrolled Recursion
MessagePack < 2.5.301; MessagePack >= 3.0 < 3.1.7; NES Essentials Plus MessagePack 2.5.192.x before 2.5.192.3
Jul 29, 2026
Medium
.NET
MessagePack-CSharp
Inefficient Algorithmic Complexity
MessagePack < 2.5.301; MessagePack >= 3.0 < 3.1.7; NES Essentials Plus MessagePack 2.5.192.x before 2.5.192.3
Jul 29, 2026
Medium
.NET
MessagePack-CSharp
Allocation of Resources Without Limits or Throttling
Improper Handling of Highly Compressed Data (Data Amplification)
MessagePack < 2.5.301; MessagePack >= 3.0 < 3.1.7; NES Essentials Plus MessagePack 2.5.192.x before 2.5.192.2
Jul 29, 2026
Medium
.NET
MessagePack-CSharp
Initialization of a Resource with an Insecure Default
MessagePack < 2.5.301; MessagePack >= 3.0 < 3.1.7; NES Essentials Plus MessagePack 2.5.192.x before 2.5.192.3
Jul 29, 2026
High
.NET
MessagePack-CSharp
Uncontrolled Recursion
MessagePack < 2.5.301; MessagePack >= 3.0 < 3.1.7; NES Essentials Plus MessagePack 2.5.192.x before 2.5.192.2
Jul 29, 2026
High
.NET
MessagePack-CSharp
Improper Input Validation (4.16)
MessagePack < 2.5.301; MessagePack >= 3.0.214-rc.1 < 3.1.7; NES Essentials Plus MessagePack 2.5.192.x before 2.5.192.2
Jul 29, 2026
High
.NET
.NET
Improper Verification of Cryptographic Signature
System.Security.Cryptography.Xml >= 6.0.0 <= 6.0.2
Aug 3, 2026
High
.NET
ASP.NET Core
Authentication Bypass by Assumed-Immutable Data
>= 6.0.0 <= 6.0.42
Aug 3, 2026
High
.NET
.NET
Allocation of Resources Without Limits or Throttling
System.Security.Cryptography.Xml >= 6.0.0 <= 6.0.2
Aug 3, 2026
High
.NET
ASP.NET Core
Incorrect Implementation of Authentication Algorithm
>= 6.0.0 <= 6.0.42
Aug 3, 2026
High
.NET
ASP.NET Core / SignalR MessagePack Protocol
Uncontrolled Resource Consumption
>= 6.0.0 <= 6.0.40 (Blazor Server) · >= 6.0.0 <= 6.0.41 (SignalR.Protocols.MessagePack)
Aug 7, 2026
High
.NET
.NET Desktop Runtime / Windows Presentation Foundation (WPF)
Improper Input Validation (4.16)
Heap-based Buffer Overflow
>= 6.0.0 <= 6.0.40
Aug 7, 2026
High
.NET
.NET
Uncontrolled Resource Consumption
Improper Input Validation (4.16)
System.Security.Cryptography.Xml >= 6.0.0 <= 6.0.2
Aug 10, 2026
High
.NET
.NET
Improper Input Validation (4.16)
Stack-based Buffer Overflow
System.Security.Cryptography.Xml >= 6.0.0 <= 6.0.2
Aug 10, 2026
High
.NET
.NET Runtime / System.Net.Mail
Improper Neutralization of Special Elements
.ASP.NET Core: >= 6.0.0 <= 6.0.39 >= 8.0.0 <= 8.0.25 >= 9.0.0 <= 9.0.14 <= 10.0.0 <= 10.0.5
Apr 15, 2026
High
.NET
.NET Desktop Runtime / Windows Presentation Foundation (WPF)
Heap-based Buffer Overflow
Improper Input Validation (4.16)
>= 6.0.0 <= 6.0.40
Aug 7, 2026
High
.NET
.NET Runtime / System.Security.Cryptography.Xml
Uncontrolled Resource Consumption
Improper Restriction of XML External Entity Reference
ASP.NET Core: >= 6.0.0 <= 6.0.39 >= 8.0.0 <= 8.0.25 >= 9.0.0 <= 9.0.14 <= 10.0.0 <= 10.0.5
Apr 15, 2026
High
.NET
ASP.NET Core Runtime Microsoft.AspNetCore.Identity
Weak Authentication
ASP.NET Core: >= 6.0.0 <= 6.0.36 Microsoft.AspNetCore.Identity: <= 2.3.0
Jul 9, 2025
Critical
.NET
ASP.NET Core Runtime, Microsoft.AspNetCore.Server.Kestrel.Core
Inconsistent Interpretation of HTTP Requests
ASP.NET Core: >= 6.0.0 <= 6.0.36 >= 8.0.0 <= 8.0.20 >= 9.0.0 <= 9.0.9 <= 10.0.0-rc.1 Microsoft.AspNetCore.Server.Kestrel.Core: <= 2.3.0
Oct 17, 2025
Medium
.NET
.NET
Cryptographic Weakness
Microsoft.NETCore.App >= 6.0.0 <= 6.0.44
Aug 19, 2026
High
.NET
.NET SDK
Improper Link Resolution Before File Access ('Link Following')
Microsoft.Build.Tasks.Core >= 17.8.0 <= 17.14.8; as bundled in the .NET 6 SDK through NES for .NET 6.0.44
Aug 19, 2026
High
.NET
ASP.NET Core
Allocation of Resources Without Limits or Throttling
Microsoft.AspNetCore.App >= 6.0.0 <= 6.0.44
Aug 19, 2026
High
.NET
.NET SDK
Resource Injection
Microsoft.Build.Tasks.Core >= 17.0.0 <= 17.8.3; as bundled in the .NET 6 SDK through NES for .NET 6.0.44
Aug 19, 2026
High
.NET
ASP.NET Core Runtime; Microsoft.AspNetCore.Identity
Weak Authentication
ASP.NET Core: >= 6.0.0 <= 6.0.36 >= 8.0.0 <= 8.0.13 >= 9.0.0 <= 9.0.2 Microsoft.AspNetCore.Identity: <= 2.3.0
Apr 4, 2025
High
.NET
.NET Runtime
Buffer Over-read
>= 6.0.0 <= 6.0.36 >= 8.0.0 <= 8.0.11 <= 9.0.0
Apr 4, 2025
High
.NET
.NET Runtime
Creation of Temporary File in Directory with Insecure Permissions
>= 6.0.0 <= 6.0.36 >= 8.0.0 <= 8.0.11 <= 9.0.0
Apr 4, 2025
High
.NET
.NET Runtime
Heap-based Buffer Overflow
>= 6.0.0 <= 6.0.36 >= 8.0.0 <= 8.0.11 <= 9.0.0
Apr 4, 2025
High
.NET
MessagePack-CSharp
Use of Weak Hash
MessagePack < 2.5.187; MessagePack >= 2.6.95-alpha < 3.0.214-rc.1; NES Essentials Plus MessagePack fork (2.5.192.x): not affected.
Jul 29, 2026
High
.NET
.NET (System.Text.Json)
Inefficient Algorithmic Complexity
System.Text.Json >= 6.0.0 < 6.0.10; System.Text.Json >= 8.0.0 < 8.0.5
Jul 29, 2026
High
.NET
ASP.NET Core Runtime
Use After Free
>= 6.0.0 <= 6.0.36 >= 8.0.0 <= 8.0.8 >= 9.0.0-preview.1.24081.5 <= 9.0.0.RC.1
Apr 4, 2025
Critical
.NET
ASP.NET Core Runtime
Use After Free
>= 6.0.0 <= 6.0.36 >= 8.0.0 <= 8.0.6
Apr 4, 2025
Medium
.NET
Azure Identity library for .NET
Concurrent Execution using Shared Resource with Improper Synchronization
Azure.Identity < 1.11.4
Jul 29, 2026
Medium
.NET
Azure Identity library for .NET (Azure.Identity)
Insufficiently Protected Credentials
Azure.Identity < 1.11.0
Jul 29, 2026
For more details on CVEs found in end-of-life software, visit our vulnerability directory.
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