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ALSA-2026:54538 — Important: .NET 8.0 security, bug fix, and enhancement update

Affected: AlmaLinux:8: aspnetcore-runtime-8.0, AlmaLinux:8: aspnetcore-runtime-dbg-8.0, AlmaLinux:8: aspnetcore-targeting-pack-8.0, AlmaLinux:8: dotnet-apphost-pack-8.0, AlmaLinux:8: dotnet-hostfxr-8.0, AlmaLinux:8: dotnet-runtime-8.0, AlmaLinux:8: dotnet-runtime-dbg-8.0, AlmaLinux:8: dotnet-sdk-8.0, AlmaLinux:8: dotnet-sdk-8.0-source-built-artifacts, AlmaLinux:8: dotnet-sdk-dbg-8.0 and 2 more

.NET is a fast, lightweight and modular platform for creating cross platform applications that work on Linux, macOS and Windows. It particularly focuses on creating console applications, web applications and micro-services. .NET contains a runtime conforming to .NET Standards a set of framework libraries, an SDK containing compilers and a 'dotnet' application to drive everything.

SDK version: 8.0.130 Runtime version: 8.0.30

Security Fix(es):

* .NET: .NET Core: .NET Security Feature Bypass Vulnerability (CVE-2026-62899) * .NET: .NET Information Disclosure Vulnerability (CVE-2026-62900) * .NET: .NET Denial of Service Vulnerability (CVE-2026-62901) * .NET: .NET Elevation of Privilege Vulnerability (CVE-2026-62909)

Bug Fix(es) and Enhancement(s):

* Update .NET 8.0 to SDK 8.0.130 and Runtime 8.0.30 (JIRA:AlmaLinux-235468)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

bdu:2026-15091

BELL-CVE-2026-62899

Affected: Alpaquita:25: dotnet8-runtime, Alpaquita:stream: dotnet8-runtime

BIT-dotnet-2026-62899 — .NET Security Feature Bypass Vulnerability

Affected: Bitnami: dotnet

Inconsistent interpretation of http requests ('http request/response smuggling') in .NET allows an unauthorized attacker to bypass a security feature over a network.

certfr-2026-avi-1001 — De multiples vulnérabilités ont été découvertes dans Microsoft Windows. Certaines d'entre elles permettent à un attaqua…

certfr-2026-avi-1001

EUVD-2026-378450

fkie_cve-2026-62899

Inconsistent interpretation of http requests ('http request/response smuggling') in .NET allows an unauthorized attacker to bypass a security feature over a network.

GHSA-r6mh-95jw-g7qg — Microsoft Security Advisory CVE-2026-62899 – .NET Security Feature Bypass 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

## Executive summary

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

Inconsistent interpretation of http requests ('http request/response smuggling') in .NET allows an unauthorized attacker to bypass a security feature over a network.

## Announcement

Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/427

## CVSS Details

- **Version:** 3.1 - **Severity:** Medium - **Score:** 5.9 - **Vector:** `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C` - **Weakness:** CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

## Affected Platforms

- **Platforms:** Linux, macOS - **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"></a>.NET 10 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, <= 10.0.10 | 10.0.11 [Microsoft.NETCore.App.Runtime.linux-arm64](https://www.nuget.org/packages/Microsoft.NETCore.App.Runtime.linux-arm64) | >= 10.0.0, <= 10.0.10 | 10.0.11 [Microsoft…

msrc_CVE-2026-62899 — .NET Security Feature Bypass Vulnerability

msrc_CVE-2026-62899

NCSC-2026-0285 — Kwetsbaarheden verholpen in Microsoft Developer Tools

NCSC-2026-0285

RHSA-2026:44914 — Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

.NET: .NET Core: .NET Security Feature Bypass Vulnerability .NET: .NET Information Disclosure Vulnerability .NET: .NET Denial of Service Vulnerability dotnet: .NET: Information Disclosure Vulnerability .NET: .NET Elevation of Privilege Vulnerability

RHSA-2026:54538 — Red Hat Security Advisory: .NET 8.0 security, bug fix, and enhancement update

.NET: .NET Core: .NET Security Feature Bypass Vulnerability .NET: .NET Information Disclosure Vulnerability .NET: .NET Denial of Service Vulnerability .NET: .NET Elevation of Privilege Vulnerability

RLSA-2026:54538 — Important: .NET 8.0 security, bug fix, and enhancement update

Affected: Rocky Linux:8: dotnet8.0

SDK version: 8.0.130 Runtime version: 8.0.30

Security Fix(es):

* .NET: .NET Core: .NET Security Feature Bypass Vulnerability (CVE-2026-62899)

* .NET: .NET Information Disclosure Vulnerability (CVE-2026-62900)

* .NET: .NET Denial of Service Vulnerability (CVE-2026-62901)

* .NET: .NET Elevation of Privilege Vulnerability (CVE-2026-62909)

Bug Fix(es) and Enhancement(s):

* Update .NET 8.0 to SDK 8.0.130 and Runtime 8.0.30 (JIRA:Rocky Linux-235468)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

UBUNTU-CVE-2026-62899

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

Inconsistent interpretation of http requests ('http request/response smuggling') in .NET allows an unauthorized attacker to bypass a security feature over a network.

WID-SEC-W-2026-2761 — Microsoft Developer Tools: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Microsoft Visual Studio Code, Microsoft Windows Server 2012, Microsoft Windows Server 2012 R2, Microsoft Windows Server 2016, Microsoft .NET Framework, Microsoft Windows Server 2019, Microsoft Windows Server 2022, Microsoft Windows Server 2025, Microsoft PowerShell, Microsoft Windows, Microsoft .NET, Microsoft Visual Studio 2022 und Microsoft Visual Studio 2026 ausnutzen, um beliebigen Programmcode auszuführen, um seine Privilegien zu erhöhen, um einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen, und um Sicherheitsvorkehrungen zu umgehen.