RHSA-2026:21293HighCVSS 7.5

Red Hat Security Advisory: .NET 8.0 security update

Published
May 27, 2026
Last Modified
August 24, 2026

🔗 CVE IDs covered (2)

CVE-2026-42899 →CVE-2026-34043 →

📋 Description

CVE-2026-34043 — serialize-javascript: serialize-javascript: Denial of Service via specially crafted array-like object serialization CVE-2026-42899 — dotnet: .NET: infinite loop allows an attacker to cause a denial of service

🎯 Affected products99

  • Red Hat Enterprise Linux AppStream (v. 9)
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)
  • aspnetcore-runtime-8.0-0:8.0.27-1.el9_8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • aspnetcore-runtime-8.0-0:8.0.27-1.el9_8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • aspnetcore-runtime-8.0-0:8.0.27-1.el9_8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • aspnetcore-runtime-8.0-0:8.0.27-1.el9_8.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • aspnetcore-runtime-dbg-8.0-0:8.0.27-1.el9_8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • aspnetcore-runtime-dbg-8.0-0:8.0.27-1.el9_8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • aspnetcore-runtime-dbg-8.0-0:8.0.27-1.el9_8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • aspnetcore-runtime-dbg-8.0-0:8.0.27-1.el9_8.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • aspnetcore-targeting-pack-8.0-0:8.0.27-1.el9_8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • aspnetcore-targeting-pack-8.0-0:8.0.27-1.el9_8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • aspnetcore-targeting-pack-8.0-0:8.0.27-1.el9_8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • aspnetcore-targeting-pack-8.0-0:8.0.27-1.el9_8.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • dotnet-apphost-pack-8.0-0:8.0.27-1.el9_8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • dotnet-apphost-pack-8.0-0:8.0.27-1.el9_8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • dotnet-apphost-pack-8.0-0:8.0.27-1.el9_8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • dotnet-apphost-pack-8.0-0:8.0.27-1.el9_8.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • dotnet-apphost-pack-8.0-debuginfo-0:8.0.27-1.el9_8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • dotnet-apphost-pack-8.0-debuginfo-0:8.0.27-1.el9_8.aarch64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)
  • dotnet-apphost-pack-8.0-debuginfo-0:8.0.27-1.el9_8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • dotnet-apphost-pack-8.0-debuginfo-0:8.0.27-1.el9_8.ppc64le as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)
  • dotnet-apphost-pack-8.0-debuginfo-0:8.0.27-1.el9_8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • dotnet-apphost-pack-8.0-debuginfo-0:8.0.27-1.el9_8.s390x as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)
  • dotnet-apphost-pack-8.0-debuginfo-0:8.0.27-1.el9_8.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • dotnet-apphost-pack-8.0-debuginfo-0:8.0.27-1.el9_8.x86_64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)
  • dotnet-hostfxr-8.0-0:8.0.27-1.el9_8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • dotnet-hostfxr-8.0-0:8.0.27-1.el9_8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • dotnet-hostfxr-8.0-0:8.0.27-1.el9_8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • dotnet-hostfxr-8.0-0:8.0.27-1.el9_8.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • +69 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: Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.

🔗 References (5)