RHSA-2026:86170 — Security Advisory

Red Hat Security Advisory: .NET 9.0 security, bug fix, and enhancement update

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Severity

Critical

Red Hat Product Security

RHEL 8

Products

Official CSAF product identity

Published · October 21, 2026

Updated · November 3, 2026

Topic

An update for .NET 9.0 is now available for Red Hat Enterprise Linux 8.

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: 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)

Bug Fix(es) and Enhancement(s):

Update .NET 9.0 to SDK 9.0.122 and Runtime 9.0.21 (JIRA:RHEL-277797)

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.