RHSA-2026:89735 — Security Advisory

Red Hat Security Advisory: .NET 9.0 security update

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Severity

Critical

Red Hat Product Security

RHEL 9

Products

Official CSAF product identity

Published · October 27, 2026

Updated · November 3, 2026

Topic

An update for .NET 9.0 is now available for Red Hat Enterprise Linux 9.6 Extended Update Support.

Red Hat Product Security has rated this update as having a security impact of Critical. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

.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: 9.0.122 Runtime version: 9.0.21

Security Fix(es):

dotnet10.0: dotnet9.0: dotnet8.0: .NET Information Disclosure Vulnerability (CVE-2026-58649)
dotnet10.0: dotnet9.0: .NET Elevation of Privilege Vulnerability (CVE-2026-69806)
dotnet10.0: dotnet9.0: dotnet: dotnet8.0: .NET Denial of Service Vulnerability (CVE-2026-58280)
dotnet10.0: dotnet8.0: dotnet9.0: dotnet: .NET Information Disclosure Vulnerability (CVE-2026-66822)
dotnet9.0: dotnet: dotnet10.0: dotnet8.0: .NET Denial of Service Vulnerability (CVE-2026-69651)
dotnet8.0: dotnet10.0: dotnet: dotnet9.0: ASP.NET Core Denial of Service Vulnerability (CVE-2026-70159)
dotnet10.0: dotnet8.0: dotnet9.0: ASP.NET Core Elevation of Privilege Vulnerability (CVE-2026-70175)
dotnet10.0: dotnet8.0: dotnet9.0: ASP.NET Core Elevation of Privilege Vulnerability (CVE-2026-70179)
dotnet9.0: dotnet8.0: dotnet10.0: ASP.NET Core Denial of Service Vulnerability (CVE-2026-70181)
dotnet: dotnet10.0: dotnet9.0: dotnet8.0: ASP.NET Core Elevation of Privilege Vulnerability (CVE-2026-70183)
dotnet10.0: dotnet9.0: dotnet8.0: ASP.NET Core Denial of Service Vulnerability (CVE-2026-70186)
dotnet: ASP.NET Core Security Feature Bypass Vulnerability (CVE-2026-70188)
dotnet9.0: dotnet8.0: dotnet10.0: ASP.NET Core Denial of Service Vulnerability (CVE-2026-70196)
dotnet: ASP.NET Core Tampering Vulnerability (CVE-2026-88092)
dotnet10.0: dotnet8.0: dotnet9.0: dotnet: MessagePack: Nested arrays can blow past buffer length limits (CVE-2026-92707)
dotnet: dotnet8.0: dotnet9.0: dotnet10.0: .NET Elevation of Privilege Vulnerability (CVE-2026-96225)
dotnet9.0: dotnet10.0: dotnet8.0: dotnet: ASP.NET Core Remote Code Execution Vulnerability (CVE-2026-96230)
dotnet: dotnet9.0: dotnet10.0: dotnet8.0: .NET Elevation of Privilege Vulnerability (CVE-2026-96231)
dotnet10.0: dotnet: dotnet8.0: dotnet9.0: ASP.NET Core Denial of Service Vulnerability (CVE-2026-96233)
dotnet: dotnet10.0: dotnet9.0: dotnet8.0: ASP.NET Core Denial of Service Vulnerability (CVE-2026-96236)
dotnet8.0: dotnet10.0: dotnet9.0: .NET Remote Code Execution Vulnerability (CVE-2026-96237)
dotnet8.0: dotnet10.0: dotnet9.0: dotnet: .NET Security Feature Bypass Vulnerability (CVE-2026-96238)

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.