RLSA-2026:21291

Synopsis

Important: .NET 8.0 security update

Description

.NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation.

New versions of .NET that address a security vulnerability are now available. The updated versions are .NET SDK 8.0.127 and .NET Runtime 8.0.27.Security Fix(es):

* serialize-javascript: serialize-javascript: Denial of Service via specially crafted array-like object serialization (CVE-2026-34043)

* dotnet: .NET: infinite loop allows an attacker to cause a denial of service (CVE-2026-42899)

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.

Affected products

Rocky Linux 8 aarch64 Rocky Linux 8 x86_64

Fixes

2453284 2476605

CVEs

CVE-2026-34043 CVE-2026-42899

Affected packages

Rocky Linux 8 aarch64 - AppStream

aspnetcore-runtime-8.0-0:8.0.27-1.el8_10.aarch64.rpm aspnetcore-runtime-dbg-8.0-0:8.0.27-1.el8_10.aarch64.rpm aspnetcore-targeting-pack-8.0-0:8.0.27-1.el8_10.aarch64.rpm dotnet8.0-0:8.0.127-1.el8_10.src.rpm dotnet8.0-debuginfo-0:8.0.127-1.el8_10.aarch64.rpm dotnet8.0-debugsource-0:8.0.127-1.el8_10.aarch64.rpm dotnet-apphost-pack-8.0-0:8.0.27-1.el8_10.aarch64.rpm dotnet-apphost-pack-8.0-debuginfo-0:8.0.27-1.el8_10.aarch64.rpm dotnet-hostfxr-8.0-0:8.0.27-1.el8_10.aarch64.rpm dotnet-hostfxr-8.0-debuginfo-0:8.0.27-1.el8_10.aarch64.rpm dotnet-runtime-8.0-0:8.0.27-1.el8_10.aarch64.rpm dotnet-runtime-8.0-debuginfo-0:8.0.27-1.el8_10.aarch64.rpm dotnet-runtime-dbg-8.0-0:8.0.27-1.el8_10.aarch64.rpm dotnet-sdk-8.0-0:8.0.127-1.el8_10.aarch64.rpm dotnet-sdk-8.0-debuginfo-0:8.0.127-1.el8_10.aarch64.rpm dotnet-sdk-dbg-8.0-0:8.0.127-1.el8_10.aarch64.rpm dotnet-targeting-pack-8.0-0:8.0.27-1.el8_10.aarch64.rpm dotnet-templates-8.0-0:8.0.127-1.el8_10.aarch64.rpm

Rocky Linux 8 x86_64 - AppStream

aspnetcore-runtime-8.0-0:8.0.27-1.el8_10.x86_64.rpm aspnetcore-runtime-dbg-8.0-0:8.0.27-1.el8_10.x86_64.rpm aspnetcore-targeting-pack-8.0-0:8.0.27-1.el8_10.x86_64.rpm dotnet8.0-0:8.0.127-1.el8_10.src.rpm dotnet8.0-debuginfo-0:8.0.127-1.el8_10.x86_64.rpm dotnet8.0-debugsource-0:8.0.127-1.el8_10.x86_64.rpm dotnet-apphost-pack-8.0-0:8.0.27-1.el8_10.x86_64.rpm dotnet-apphost-pack-8.0-debuginfo-0:8.0.27-1.el8_10.x86_64.rpm dotnet-hostfxr-8.0-0:8.0.27-1.el8_10.x86_64.rpm dotnet-hostfxr-8.0-debuginfo-0:8.0.27-1.el8_10.x86_64.rpm dotnet-runtime-8.0-0:8.0.27-1.el8_10.x86_64.rpm dotnet-runtime-8.0-debuginfo-0:8.0.27-1.el8_10.x86_64.rpm dotnet-runtime-dbg-8.0-0:8.0.27-1.el8_10.x86_64.rpm dotnet-sdk-8.0-0:8.0.127-1.el8_10.x86_64.rpm dotnet-sdk-8.0-debuginfo-0:8.0.127-1.el8_10.x86_64.rpm dotnet-sdk-dbg-8.0-0:8.0.127-1.el8_10.x86_64.rpm dotnet-targeting-pack-8.0-0:8.0.27-1.el8_10.x86_64.rpm dotnet-templates-8.0-0:8.0.127-1.el8_10.x86_64.rpm

Rocky Linux 8 aarch64 - PowerTools

dotnet-sdk-8.0-source-built-artifacts-0:8.0.127-1.el8_10.aarch64.rpm

Rocky Linux 8 x86_64 - PowerTools

dotnet-sdk-8.0-source-built-artifacts-0:8.0.127-1.el8_10.x86_64.rpm