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High RLSA-2026:55856 4 CVEs

Important: .NET 9.0 security, bug fix, and enhancement update

Published Aug 19, 2026 · Updated Aug 19, 2026

Summary

.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 [rhel-9.8.z] (JIRA:Rocky Linux-235476)

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.

Fixed packages 1

ReleasePackageFixed in
Rocky Linux · 9 dotnet9.0 0:9.0.120-1.el9_8

Vulnerabilities 4

References

  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2512175
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2512179
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2512180
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2512185
  • advisory
    https://access.redhat.com/errata/RHSA-2026:55856