Red Hat Product Security has released a wave of updates targeting security flaws in several key enterprise products. These advisories cover widely used tools including Firefox, Thunderbird, and multiple .NET versions running on RHEL systems ranging from version 7 to 10. While most advisories carry an Important rating, specific OpenShift packages are assigned lower severity levels instead. System administrators need to review the reference links within each erratum to determine which patches apply to their specific infrastructure.

RHSA-2026:7243: Important: OpenShift Container Platform 4.19.28 bug fix and security update
RHSA-2026:8427: Important: firefox security update
RHSA-2026:8469: Important: .NET 8.0 security update
RHSA-2026:8468: Important: .NET 8.0 security update
RHSA-2026:8472: Important: .NET 9.0 security update
RHSA-2026:8470: Important: .NET 8.0 security update
RHSA-2026:8459: Important: thunderbird security update
RHSA-2026:8458: Important: freerdp security update
RHSA-2026:8456: Important: osbuild-composer security update
RHSA-2026:8434: Important: rhc security update
RHSA-2026:7238: Moderate: OpenShift Container Platform 4.13.65 packages and security update
RHSA-2026:7239: Important: OpenShift Container Platform 4.13.65 bug fix and security update
RHSA-2026:8492: Important: libarchive security update
RHSA-2026:8474: Important: .NET 9.0 security update
RHSA-2026:8471: Important: .NET 10.0 security update
RHSA-2026:8610: Important: perl-XML-Parser security update
RHSA-2026:8608: Important: perl-XML-Parser security update
RHSA-2026:8609: Important: perl-XML-Parser security update
RHSA-2026:8578: Important: perl-XML-Parser security update
RHSA-2026:8577: Important: perl-XML-Parser security update
RHSA-2026:8548: Important: nghttp2 security update
RHSA-2026:8547: Important: nghttp2 security update
RHSA-2026:8545: Important: nghttp2 security update
RHSA-2026:8546: Important: nghttp2 security update
RHSA-2026:8538: Important: nghttp2 security update
RHSA-2026:8540: Important: nghttp2 security update
RHSA-2026:8539: Important: nghttp2 security update
RHSA-2026:8541: Important: nghttp2 security update
RHSA-2026:8534: Important: libarchive security update
RHSA-2026:8517: Important: libarchive security update
RHSA-2026:8521: Important: libarchive security update
RHSA-2026:8510: Important: libarchive security update
RHSA-2026:8509: Important: Red Hat AMQ Broker 7.14.0 release and security update
RHSA-2026:8473: Important: .NET 10.0 security update
RHSA-2026:8475: Important: .NET 9.0 security update
RHSA-2026:8467: Important: .NET 10.0 security update
RHSA-2026:8457: Important: freerdp security update

RHSA-2026:7243: Important: OpenShift Container Platform 4.19.28 bug fix and security update

Red Hat OpenShift Container Platform release 4.19.28 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-2026:7243: Important: OpenShift Container Platform 4.19.28 bug fix and security update

RHSA-2026:8427: Important: firefox security update

An update for firefox is now available for Red Hat Enterprise Linux 7 Extended Lifecycle 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-2026:8427: Important: firefox security update

RHSA-2026:8469: 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-2026:8469: Important: .NET 8.0 security update

RHSA-2026:8468: 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-2026:8468: Important: .NET 8.0 security update

RHSA-2026:8472: Important: .NET 9.0 security update

An update for .NET 9.0 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-2026:8472: Important: .NET 9.0 security update

RHSA-2026:8470: 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-2026:8470: Important: .NET 8.0 security update

RHSA-2026:8459: 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-2026:8459: Important: thunderbird security update

RHSA-2026:8458: Important: freerdp security update

An update for freerdp 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-2026:8458: Important: freerdp security update

RHSA-2026:8456: Important: osbuild-composer security update

An update for osbuild-composer 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-2026:8456: Important: osbuild-composer security update

RHSA-2026:8434: Important: rhc security update

An update for rhc is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On.

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-2026:8434: Important: rhc security update

RHSA-2026:7238: Moderate: OpenShift Container Platform 4.13.65 packages and security update

Red Hat OpenShift Container Platform release 4.13.65 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 4.13.

Red Hat Product Security has rated this update as having a security impact of Low. 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-2026:7238: Moderate: OpenShift Container Platform 4.13.65 packages and security update

RHSA-2026:7239: Important: OpenShift Container Platform 4.13.65 bug fix and security update

Red Hat OpenShift Container Platform release 4.13.65 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 4.13.

Red Hat Product Security has rated this update as having a security impact of Low. 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-2026:7239: Important: OpenShift Container Platform 4.13.65 bug fix and security update

RHSA-2026:8492: Important: libarchive security update

An update for libarchive 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-2026:8492: Important: libarchive security update

RHSA-2026:8474: 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-2026:8474: Important: .NET 9.0 security update

RHSA-2026:8471: 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-2026:8471: Important: .NET 10.0 security update

RHSA-2026:8610: Important: perl-XML-Parser security update

An update for perl-XML-Parser 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-2026:8610: Important: perl-XML-Parser security update

RHSA-2026:8608: Important: perl-XML-Parser security update

An update for perl-XML-Parser is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On.

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-2026:8608: Important: perl-XML-Parser security update

RHSA-2026:8609: Important: perl-XML-Parser security update

An update for perl-XML-Parser is now available for Red Hat Enterprise Linux 8.2 Advanced 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-2026:8609: Important: perl-XML-Parser security update

RHSA-2026:8578: Important: perl-XML-Parser security update

An update for perl-XML-Parser is now available for Red Hat Enterprise Linux 7 Extended Lifecycle 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-2026:8578: Important: perl-XML-Parser security update

RHSA-2026:8577: Important: perl-XML-Parser security update

An update for perl-XML-Parser 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-2026:8577: Important: perl-XML-Parser security update

RHSA-2026:8548: Important: nghttp2 security update

An update for nghttp2 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-2026:8548: Important: nghttp2 security update

RHSA-2026:8547: Important: nghttp2 security update

An update for nghttp2 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-2026:8547: Important: nghttp2 security update

RHSA-2026:8545: Important: nghttp2 security update

An update for nghttp2 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-2026:8545: Important: nghttp2 security update

RHSA-2026:8546: Important: nghttp2 security update

An update for nghttp2 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-2026:8546: Important: nghttp2 security update

RHSA-2026:8538: Important: nghttp2 security update

An update for nghttp2 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-2026:8538: Important: nghttp2 security update

RHSA-2026:8540: Important: nghttp2 security update

An update for nghttp2 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-2026:8540: Important: nghttp2 security update

RHSA-2026:8539: Important: nghttp2 security update

An update for nghttp2 is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On.

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-2026:8539: Important: nghttp2 security update

RHSA-2026:8541: Important: nghttp2 security update

An update for nghttp2 is now available for Red Hat Enterprise Linux 8.2 Advanced 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-2026:8541: Important: nghttp2 security update

RHSA-2026:8534: Important: libarchive security update

An update for libarchive 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-2026:8534: Important: libarchive security update

RHSA-2026:8517: Important: libarchive security update

An update for libarchive is now available for Red Hat Enterprise Linux 7 Extended Lifecycle 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-2026:8517: Important: libarchive security update

RHSA-2026:8521: Important: libarchive security update

An update for libarchive is now available for Red Hat Enterprise Linux 8.2 Advanced 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-2026:8521: Important: libarchive security update

RHSA-2026:8510: Important: libarchive security update

An update for libarchive 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-2026:8510: Important: libarchive security update

RHSA-2026:8509: Important: Red Hat AMQ Broker 7.14.0 release and security update

Red Hat AMQ Broker 7.14.0 is now available from the Red Hat Customer Portal.

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-2026:8509: Important: Red Hat AMQ Broker 7.14.0 release and security update

RHSA-2026:8473: 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-2026:8473: Important: .NET 10.0 security update

RHSA-2026:8475: 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-2026:8475: Important: .NET 9.0 security update

RHSA-2026:8467: Important: .NET 10.0 security update

An update for .NET 10.0 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-2026:8467: Important: .NET 10.0 security update

RHSA-2026:8457: Important: freerdp security update

An update for freerdp 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-2026:8457: Important: freerdp security update