RHSA-2026:86171CriticalCVSS 9.4

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

Published
October 20, 2026
Last Modified
October 26, 2026

🔗 CVE IDs covered (20)

CVE-2026-70186 →CVE-2026-96230 →CVE-2026-96231 →CVE-2026-66822 →CVE-2026-70159 →CVE-2026-70175 →CVE-2026-70183 →CVE-2026-70188 →CVE-2026-96233 →CVE-2026-96236 →CVE-2026-96237 →CVE-2026-96238 →CVE-2026-70181 →CVE-2026-70196 →CVE-2026-96225 →CVE-2026-88092 →CVE-2026-92707 →CVE-2026-58280 →CVE-2026-69651 →CVE-2026-70179 →

📋 Description

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

🎯 Affected products109

  • Red Hat Enterprise Linux AppStream (v. 9)
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)
  • aspnetcore-runtime-9.0-0:9.0.21-1.el9_8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • aspnetcore-runtime-9.0-0:9.0.21-1.el9_8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • aspnetcore-runtime-9.0-0:9.0.21-1.el9_8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • aspnetcore-runtime-9.0-0:9.0.21-1.el9_8.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • aspnetcore-runtime-dbg-9.0-0:9.0.21-1.el9_8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • aspnetcore-runtime-dbg-9.0-0:9.0.21-1.el9_8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • aspnetcore-runtime-dbg-9.0-0:9.0.21-1.el9_8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • aspnetcore-runtime-dbg-9.0-0:9.0.21-1.el9_8.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • aspnetcore-targeting-pack-9.0-0:9.0.21-1.el9_8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • aspnetcore-targeting-pack-9.0-0:9.0.21-1.el9_8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • aspnetcore-targeting-pack-9.0-0:9.0.21-1.el9_8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • aspnetcore-targeting-pack-9.0-0:9.0.21-1.el9_8.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • dotnet-apphost-pack-9.0-0:9.0.21-1.el9_8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • dotnet-apphost-pack-9.0-0:9.0.21-1.el9_8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • dotnet-apphost-pack-9.0-0:9.0.21-1.el9_8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • dotnet-apphost-pack-9.0-0:9.0.21-1.el9_8.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • dotnet-apphost-pack-9.0-debuginfo-0:9.0.21-1.el9_8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • dotnet-apphost-pack-9.0-debuginfo-0:9.0.21-1.el9_8.aarch64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)
  • dotnet-apphost-pack-9.0-debuginfo-0:9.0.21-1.el9_8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • dotnet-apphost-pack-9.0-debuginfo-0:9.0.21-1.el9_8.ppc64le as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)
  • dotnet-apphost-pack-9.0-debuginfo-0:9.0.21-1.el9_8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • dotnet-apphost-pack-9.0-debuginfo-0:9.0.21-1.el9_8.s390x as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)
  • dotnet-apphost-pack-9.0-debuginfo-0:9.0.21-1.el9_8.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • dotnet-apphost-pack-9.0-debuginfo-0:9.0.21-1.el9_8.x86_64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)
  • dotnet-hostfxr-9.0-0:9.0.21-1.el9_8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • dotnet-hostfxr-9.0-0:9.0.21-1.el9_8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • dotnet-hostfxr-9.0-0:9.0.21-1.el9_8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • dotnet-hostfxr-9.0-0:9.0.21-1.el9_8.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • +79 more not shown

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. Workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. The upstream advisory states that the issue is fixed in ASP.NET Core Runtime 8.0.32, 9.0.21, and 10.0.13 (and 11.0.0-rc.2 for the .NET 11 pre-release channel); users should apply the patched versions of the affected .NET components for their Red Hat offerings once available.

🔗 References (23)