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ALSA-2026:41893 — Important: .NET 8.0 security, bug fix, and enhancement update

Affected: AlmaLinux:10: aspnetcore-runtime-8.0, AlmaLinux:10: aspnetcore-runtime-dbg-8.0, AlmaLinux:10: aspnetcore-targeting-pack-8.0, AlmaLinux:10: dotnet-apphost-pack-8.0, AlmaLinux:10: dotnet-hostfxr-8.0, AlmaLinux:10: dotnet-runtime-8.0, AlmaLinux:10: dotnet-runtime-dbg-8.0, AlmaLinux:10: dotnet-sdk-8.0, AlmaLinux:10: dotnet-sdk-8.0-source-built-artifacts, AlmaLinux:10: dotnet-sdk-dbg-8.0 and 2 more

.NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation.

New versions of .NET that address a security vulnerability are now available. The updated versions are .NET SDK 8.0.129 and .NET Runtime 8.0.29.

Security Fix(es):

* dotnet: SocketsHttpHandler Http2Connection - HTTP/2 SETTINGS/PING ACK flood causing OOM (CVE-2026-50651) * dotnet: .NET Core: Denial of Service via type confusion (CVE-2026-57108) * ASP.NET Core: ASP.NET Core: Denial of Service via uncontrolled resource allocation (CVE-2026-56170) * ASP.NET Core: ASP.NET Core: Privilege Escalation via Incorrect Authentication Algorithm (CVE-2026-47300) * ASP.NET Core: ASP.NET Core: Privilege Elevation via Authentication Bypass (CVE-2026-47303) * dotnet: .NET Security Feature Bypass Vulnerability (CVE-2026-47304) * dotnet: .NET: Denial of Service vulnerability due to uncontrolled resource allocation (CVE-2026-47302) * dotnet: .NET Framework: Privilege escalation via code injection (CVE-2026-50650) * dotnet: .NET: Security feature bypass due to incorrect authorization (CVE-2026-50528) * dotnet: .NET: Local code execution via deserialization of untrusted data (CVE-2026-50649) * dotnet: .NET: Local tampering via improper link resolution (CVE-2026-50526) * dotnet: .NET Framework: Local Code Execution via Protection Mechanism Failure (CVE-2026-50646) * dotnet: .NET: Denial of Service due to uncontrolled re…

bdu:2026-10123

BIT-dotnet-2026-50659 — .NET Spoofing Vulnerability

Affected: Bitnami: dotnet

Improper encoding or escaping of output in .NET allows an authorized attacker to perform spoofing over a network.

certfr-2026-avi-0869 — De multiples vulnérabilités ont été découvertes dans Microsoft Windows. Certaines d'entre elles permettent à un attaqua…

certfr-2026-avi-0869

EUVD-2026-376861

fkie_cve-2026-50659

Improper encoding or escaping of output in .NET allows an authorized attacker to perform spoofing over a network.

GHSA-74jp-vm22-8q8x — Microsoft Security Advisory CVE-2026-50659 – .NET Spoofing Vulnerability

Affected: NuGet: Microsoft.NetCore.App.Runtime.linux-arm, NuGet: Microsoft.NetCore.App.Runtime.linux-arm64, NuGet: Microsoft.NetCore.App.Runtime.linux-musl-arm, NuGet: Microsoft.NetCore.App.Runtime.linux-musl-arm64, NuGet: Microsoft.NetCore.App.Runtime.linux-musl-x64, NuGet: Microsoft.NetCore.App.Runtime.linux-x64, NuGet: Microsoft.NetCore.App.Runtime.osx-arm64, NuGet: Microsoft.NetCore.App.Runtime.osx-x64, NuGet: Microsoft.NetCore.App.Runtime.win-arm, NuGet: Microsoft.NetCore.App.Runtime.win-arm64 and 2 more

## Executive summary

Microsoft is releasing this security advisory to provide information about a vulnerability in .NET SMTP client (System.Net.Mail). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.

A spoofing vulnerability exists in the SMTP client implementation (System.Net.Mail) in .NET 8, .NET 9, and .NET 10, where an attacker can spoof messages during message routing.

## Announcement

Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/**TBD**

## CVSS Details

- **Version:** 3.1 - **Severity:** Medium - **Score:** 6.5 - **Vector:** `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N` - **Weakness:** CWE-116 (Improper Encoding or Escaping of Output)

## Affected Platforms

- **Platforms:** All - **Architectures:** All

## <a name="affected-packages"></a>Affected Packages The vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below

### <a name=".NET 10.0"></a>.NET 10.0 Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- [Microsoft.NetCore.App.Runtime.linux-arm](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-arm) | >= 10.0.0, <= 10.0.9 | 10.0.10 [Microsoft.NetCore.App.Runtime.linux-arm64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-arm64) | >= 10.0.0, <= 10.0.9 | 10.0.10 [Microsoft.NetCor…

msrc_CVE-2026-50659 — .NET Spoofing Vulnerability

msrc_CVE-2026-50659

NCSC-2026-0235 — Kwetsbaarheden verholpen in Microsoft Developer Tools

NCSC-2026-0235

RHSA-2026:26638 — Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

dotnet: .NET: Local file tampering via link following vulnerability dotnet: ASP.NET Core: Denial of Service via uncontrolled resource consumption ws: ws: Uninitialized memory disclosure via `websocket.close()` with `TypedArray` ASP.NET Core: ASP.NET Core: Privilege Escalation via Incorrect Authentication Algorithm dotnet: .NET: Denial of Service vulnerability due to uncontrolled resource allocation ASP.NET Core: ASP.NET Core: Privilege Elevation via Authentication Bypass dotnet: .NET Framework: Denial of Service via improper input validation dotnet: .NET: Denial of Service due to uncontrolled resource allocation dotnet: .NET: Local tampering via improper link resolution dotnet: .NET Framework: Denial of Service via network-based buffer overflow dotnet: .NET: Security feature bypass due to incorrect authorization dotnet: .NET Framework: Remote Denial of Service due to uncontrolled resource allocation dotnet: SocketsHttpHandler Http2Connection - HTTP/2 SETTINGS/PING ACK flood causing OOM .NET: .NET: Network Spoofing Vulnerability ASP.NET Core: ASP.NET Core: Denial of Service via uncontrolled resource allocation dotnet: .NET Core: Denial of Service via type confusion

RHSA-2026:41893 — Red Hat Security Advisory: .NET 8.0 security, bug fix, and enhancement update

ASP.NET Core: ASP.NET Core: Privilege Escalation via Incorrect Authentication Algorithm dotnet: .NET: Denial of Service vulnerability due to uncontrolled resource allocation ASP.NET Core: ASP.NET Core: Privilege Elevation via Authentication Bypass dotnet: .NET Security Feature Bypass Vulnerability dotnet: .NET Framework: Denial of Service via improper input validation dotnet: .NET: Denial of Service due to uncontrolled resource allocation dotnet: .NET: Local tampering via improper link resolution dotnet: .NET Framework: Denial of Service via network-based buffer overflow dotnet: .NET: Security feature bypass due to incorrect authorization dotnet: .NET Framework: Local Code Execution via Protection Mechanism Failure dotnet: .NET Framework: Remote Denial of Service due to uncontrolled resource allocation dotnet: .NET: Local code execution via deserialization of untrusted data dotnet: .NET Framework: Privilege escalation via code injection dotnet: SocketsHttpHandler Http2Connection - HTTP/2 SETTINGS/PING ACK flood causing OOM .NET: .NET: Network Spoofing Vulnerability ASP.NET Core: ASP.NET Core: Denial of Service via uncontrolled resource allocation dotnet: .NET Core: Denial of Service via type confusion

RLSA-2026:41893 — Important: .NET 8.0 security, bug fix, and enhancement update

Affected: Rocky Linux:10: dotnet8.0

.NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation.

New versions of .NET that address a security vulnerability are now available. The updated versions are .NET SDK 8.0.129 and .NET Runtime 8.0.29.

Security Fix(es):

* dotnet: SocketsHttpHandler Http2Connection - HTTP/2 SETTINGS/PING ACK flood causing OOM (CVE-2026-50651)

* dotnet: .NET Core: Denial of Service via type confusion (CVE-2026-57108)

* ASP.NET Core: ASP.NET Core: Denial of Service via uncontrolled resource allocation (CVE-2026-56170)

* ASP.NET Core: ASP.NET Core: Privilege Escalation via Incorrect Authentication Algorithm (CVE-2026-47300)

* ASP.NET Core: ASP.NET Core: Privilege Elevation via Authentication Bypass (CVE-2026-47303)

* dotnet: .NET Security Feature Bypass Vulnerability (CVE-2026-47304)

* dotnet: .NET: Denial of Service vulnerability due to uncontrolled resource allocation (CVE-2026-47302)

* dotnet: .NET Framework: Privilege escalation via code injection (CVE-2026-50650)

* dotnet: .NET: Security feature bypass due to incorrect authorization (CVE-2026-50528)

* dotnet: .NET: Local code execution via deserialization of untrusted data (CVE-2026-50649)

* dotnet: .NET: Local tampering via improper link resolution (CVE-2026-50526)

* dotnet: .NET Framework: Local Code Execution via Protection Mechanism Failure (CVE-2026-50646)

* dotnet: .NET: Denial of Service due to uncontrolled resource allocation (C…

UBUNTU-CVE-2026-50659

Affected: Ubuntu:22.04:LTS: dotnet6, Ubuntu:22.04:LTS: dotnet7, Ubuntu:22.04:LTS: dotnet8, Ubuntu:24.04:LTS: dotnet10, Ubuntu:24.04:LTS: dotnet8, Ubuntu:26.04:LTS: dotnet10

Improper encoding or escaping of output in .NET allows an authorized attacker to perform spoofing over a network.

WID-SEC-W-2026-2324 — Microsoft DeveloperTools: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Microsoft Visual Studio Code, .NET Framework, Microsoft .NET, Visual Studio 2022 und Visual Studio 2026 ausnutzen, um erweiterte Berechtigungen, einschließlich Administratorrechte, zu erlangen, beliebigen Code auszuführen, Sicherheitsmaßnahmen zu umgehen, Daten zu manipulieren oder offenzulegen, einen Denial-of-Service-Zustand auszulösen oder Spoofing-Angriffe durchzuführen.