RHSA-2026:21293

Description

Red Hat Security Advisory: .NET 8.0 security update

CVSS Metrics

• v3.1•HIGH•Score: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Systems

• redhat•aspnetcore-runtime-8.0

  < 0:8.0.27-1.el9_8 | < 0:8.0.27-1.el9_8

• redhat•aspnetcore-runtime-dbg-8.0

  < 0:8.0.27-1.el9_8 | < 0:8.0.27-1.el9_8

• redhat•aspnetcore-targeting-pack-8.0

  < 0:8.0.27-1.el9_8 | < 0:8.0.27-1.el9_8

• redhat•dotnet-apphost-pack-8.0

  < 0:8.0.27-1.el9_8 | < 0:8.0.27-1.el9_8

• redhat•dotnet-apphost-pack-8.0-debuginfo

  < 0:8.0.27-1.el9_8 | < 0:8.0.27-1.el9_8

• redhat•dotnet-hostfxr-8.0

  < 0:8.0.27-1.el9_8 | < 0:8.0.27-1.el9_8

• redhat•dotnet-hostfxr-8.0-debuginfo

  < 0:8.0.27-1.el9_8 | < 0:8.0.27-1.el9_8

• redhat•dotnet-runtime-8.0

  < 0:8.0.27-1.el9_8 | < 0:8.0.27-1.el9_8

• redhat•dotnet-runtime-8.0-debuginfo

  < 0:8.0.27-1.el9_8 | < 0:8.0.27-1.el9_8

• redhat•dotnet-runtime-dbg-8.0

  < 0:8.0.27-1.el9_8 | < 0:8.0.27-1.el9_8

• redhat•dotnet-sdk-8.0

  < 0:8.0.127-1.el9_8 | < 0:8.0.127-1.el9_8

• redhat•dotnet-sdk-8.0-debuginfo

  < 0:8.0.127-1.el9_8 | < 0:8.0.127-1.el9_8

• redhat•dotnet-sdk-8.0-source-built-artifacts

  < 0:8.0.127-1.el9_8 | < 0:8.0.127-1.el9_8

• redhat•dotnet-sdk-dbg-8.0

  < 0:8.0.127-1.el9_8 | < 0:8.0.127-1.el9_8

• redhat•dotnet-targeting-pack-8.0

  < 0:8.0.27-1.el9_8 | < 0:8.0.27-1.el9_8

• redhat•dotnet-templates-8.0

  < 0:8.0.127-1.el9_8 | < 0:8.0.127-1.el9_8

• redhat•dotnet8.0

  < 0:8.0.127-1.el9_8 | < 0:8.0.127-1.el9_8

• redhat•dotnet8.0-debuginfo

  < 0:8.0.127-1.el9_8 | < 0:8.0.127-1.el9_8

• redhat•dotnet8.0-debugsource

  < 0:8.0.127-1.el9_8 | < 0:8.0.127-1.el9_8

References (15)

• https://access.redhat.com/errata/RHSA-2026:21293
• https://access.redhat.com/security/updates/classification/#important
• https://bugzilla.redhat.com/show_bug.cgi?id=2453284
• https://bugzilla.redhat.com/show_bug.cgi?id=2476605
• https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_21293.json
• https://access.redhat.com/security/cve/CVE-2026-34043
• https://www.cve.org/CVERecord?id=CVE-2026-34043
• https://nvd.nist.gov/vuln/detail/CVE-2026-34043
• https://github.com/yahoo/serialize-javascript/commit/f147e90269b58bb6e539cfdf3d0e20d6ad14204b
• https://github.com/yahoo/serialize-javascript/releases/tag/v7.0.5
• https://github.com/yahoo/serialize-javascript/security/advisories/GHSA-qj8w-gfj5-8c6v
• https://access.redhat.com/security/cve/CVE-2026-42899
• https://www.cve.org/CVERecord?id=CVE-2026-42899
• https://nvd.nist.gov/vuln/detail/CVE-2026-42899
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42899