RHSA-2026:54550 — Security Advisory

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 Important. 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.

.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: 9.0.120 Runtime version: 9.0.19

Security Fix(es):

• .NET: .NET Core: .NET Security Feature Bypass Vulnerability (CVE-2026-62899)

• .NET: .NET Information Disclosure Vulnerability (CVE-2026-62900)

• .NET: .NET Denial of Service Vulnerability (CVE-2026-62901)

• .NET: .NET Elevation of Privilege Vulnerability (CVE-2026-62909)

Bug Fix(es) and Enhancement(s):

• Update .NET 9.0 to SDK 9.0.120 and Runtime 9.0.19 (JIRA:RHEL-235473)

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.