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Red Hat has released a batch of important security advisories for 2026 that address vulnerabilities across multiple enterprise software packages. These updates target widely used components like the Linux kernel, .NET frameworks, cockpit management tools, and OpenShift Container Platform on various RHEL versions. You should review the specific CVE references before applying any patches to your systems. Every advisory carries an Important severity rating from Red Hat Product Security while providing detailed CVSS scores for thorough evaluation.

RHSA-2026:21296: Important: .NET 9.0 security update
RHSA-2026:21295: Important: .NET 10.0 security update
RHSA-2026:21254: Important: libcap security update
RHSA-2026:20322: Important: Red Hat build of MicroShift 4.19.32 security update
RHSA-2026:21209: Important: kernel security update
RHSA-2026:21297: Important: .NET 10.0 security update
RHSA-2026:21294: Important: .NET 9.0 security update
RHSA-2026:21293: Important: .NET 8.0 security update
RHSA-2026:21298: Important: openssh security update
RHSA-2026:21291: Important: .NET 8.0 security update
RHSA-2026:21286: Important: .NET 8.0 security update
RHSA-2026:21557: Important: kernel security update
RHSA-2026:20436: Important: Red Hat build of MicroShift 4.16.63 security update
RHSA-2026:21517: Important: fence-agents security update
RHSA-2026:21516: Important: cockpit security update
RHSA-2026:21515: Important: cockpit security update
RHSA-2026:21468: Important: cockpit security update
RHSA-2026:21431: Important: fence-agents security update
RHSA-2026:21433: Important: httpd security update
RHSA-2026:21391: Important: httpd security update
RHSA-2026:21398: Important: openssh security update
RHSA-2026:21394: Important: cockpit security update
RHSA-2026:21395: Important: cockpit security update
RHSA-2026:21378: Important: firefox security update
RHSA-2026:21390: Important: cockpit security update
RHSA-2026:21381: Important: thunderbird security update
RHSA-2026:21380: Important: firefox security update
RHSA-2026:21382: Important: firefox security update
RHSA-2026:20040: Important: OpenShift Container Platform 4.19.32 bug fix and security update




RHSA-2026:21296: Important: .NET 9.0 security update


An update for .NET 9.0 is now available for Red Hat Enterprise Linux 9.

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.


RHSA-2026:21296: Important: .NET 9.0 security update



RHSA-2026:21295: Important: .NET 10.0 security update


An update for .NET 10.0 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.


RHSA-2026:21295: Important: .NET 10.0 security update



RHSA-2026:21254: Important: libcap security update


An update for libcap is now available for Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions.

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.


RHSA-2026:21254: Important: libcap security update



RHSA-2026:20322: Important: Red Hat build of MicroShift 4.19.32 security update


Red Hat build of MicroShift release 4.19.32 is now available with updates
to packages and images that include a security update.

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.


RHSA-2026:20322: Important: Red Hat build of MicroShift 4.19.32 security update



RHSA-2026:21209: Important: kernel security update


An update for kernel is now available for Red Hat Enterprise Linux 9.4 Extended Update Support.

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.


RHSA-2026:21209: Important: kernel security update



RHSA-2026:21297: Important: .NET 10.0 security update


An update for .NET 10.0 is now available for Red Hat Enterprise Linux 9.

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.


RHSA-2026:21297: Important: .NET 10.0 security update



RHSA-2026:21294: Important: .NET 9.0 security update


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.


RHSA-2026:21294: Important: .NET 9.0 security update



RHSA-2026:21293: Important: .NET 8.0 security update


An update for .NET 8.0 is now available for Red Hat Enterprise Linux 9.

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.


RHSA-2026:21293: Important: .NET 8.0 security update



RHSA-2026:21298: Important: openssh security update


An update for openssh is now available for Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions and Red Hat Enterprise Linux 8.8 Telecommunications Update Service.

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.


RHSA-2026:21298: Important: openssh security update



RHSA-2026:21291: Important: .NET 8.0 security update


An update for .NET 8.0 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.


RHSA-2026:21291: Important: .NET 8.0 security update



RHSA-2026:21286: Important: .NET 8.0 security update


An update for .NET 8.0 is now available for Red Hat Enterprise Linux 10.

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.


RHSA-2026:21286: Important: .NET 8.0 security update



RHSA-2026:21557: Important: kernel security update


An update for kernel is now available for Red Hat Enterprise Linux 10.

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.


RHSA-2026:21557: Important: kernel security update



RHSA-2026:20436: Important: Red Hat build of MicroShift 4.16.63 security update


Red Hat build of MicroShift release 4.16.63 is now available with updates
to packages and images that include a security update.

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.


RHSA-2026:20436: Important: Red Hat build of MicroShift 4.16.63 security update



RHSA-2026:21517: Important: fence-agents security update


An update for fence-agents is now available for Red Hat Enterprise Linux 9.4 Extended Update Support.

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.


RHSA-2026:21517: Important: fence-agents security update



RHSA-2026:21516: Important: cockpit security update


An update for cockpit is now available for Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions, and Red Hat Enterprise Linux 8.6 Telecommunications Update Service.

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.


RHSA-2026:21516: Important: cockpit security update



RHSA-2026:21515: Important: cockpit security update


An update for cockpit is now available for Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions and Red Hat Enterprise Linux 8.8 Telecommunications Update Service.

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.


RHSA-2026:21515: Important: cockpit security update



RHSA-2026:21468: Important: cockpit security update


An update for cockpit is now available for Red Hat Enterprise Linux 9.

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.


RHSA-2026:21468: Important: cockpit security update



RHSA-2026:21431: Important: fence-agents security update


An update for fence-agents is now available for Red Hat Enterprise Linux 9.6 Extended Update Support.

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.


RHSA-2026:21431: Important: fence-agents security update



RHSA-2026:21433: Important: httpd security update


An update for httpd is now available for Red Hat Enterprise Linux 10.

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.


RHSA-2026:21433: Important: httpd security update



RHSA-2026:21391: Important: httpd security update


An update for httpd is now available for Red Hat Enterprise Linux 9.

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.


RHSA-2026:21391: Important: httpd security update



RHSA-2026:21398: Important: openssh security update


An update for openssh is now available for Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions, and Red Hat Enterprise Linux 8.6 Telecommunications Update Service.

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.


RHSA-2026:21398: Important: openssh security update



RHSA-2026:21394: Important: cockpit security update


An update for cockpit is now available for Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions.

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.


RHSA-2026:21394: Important: cockpit security update



RHSA-2026:21395: Important: cockpit security update


An update for cockpit is now available for Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions.

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.


RHSA-2026:21395: Important: cockpit security update



RHSA-2026:21378: Important: firefox security update


An update for firefox is now available for Red Hat Enterprise Linux 9.

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.


RHSA-2026:21378: Important: firefox security update



RHSA-2026:21390: Important: cockpit security update


An update for cockpit is now available for Red Hat Enterprise Linux 10.0 Extended Update Support.

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.


RHSA-2026:21390: Important: cockpit security update



RHSA-2026:21381: Important: thunderbird security update


An update for thunderbird is now available for Red Hat Enterprise Linux 9.

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.


RHSA-2026:21381: Important: thunderbird security update



RHSA-2026:21380: Important: firefox security update


An update for firefox is now available for Red Hat Enterprise Linux 10.

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.


RHSA-2026:21380: Important: firefox security update



RHSA-2026:21382: Important: firefox security update


An update for firefox 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.


RHSA-2026:21382: Important: firefox security update



RHSA-2026:20040: Important: OpenShift Container Platform 4.19.32 bug fix and security update


Red Hat OpenShift Container Platform release 4.19.32 is now available with updates to packages and images that fix several bugs and add enhancements.

This release includes a security update for Red Hat OpenShift Container Platform 4.19.

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.


RHSA-2026:20040: Important: OpenShift Container Platform 4.19.32 bug fix and security update