RHSA-2026:54883: Important: Red Hat build of MicroShift 4.19.43 security update

Published Aug 19, 2026
·
Updated

Important: Red Hat build of MicroShift 4.19.43 security update

Other sources

Red Hat build of MicroShift is Red Hat's light-weight Kubernetesorchestration solution designed for edge device deployments and is builtfrom the edge capabilities of Red Hat OpenShift Container Platform.MicroShift is an application that is deployed on top of Red Hat EnterpriseLinux devices at the edge, providing an efficient way to operatesingle-node clusters in these low-resource environments.This advisory contains the RPM packages for Red Hat build of MicroShift4.19.43. Read the following advisory for the container images for thisrelease:https://access.redhat.com/errata/RHSA-2026:54555 Security Fix(es): net/mail: golang: Go net/mail: Denial of Service via crafted email inputs (CVE-2026-39820)All Red Hat build of MicroShift 4.19 users are advised to use these updatedpackages and images when they are available in the RPM repository.

— Red Hat

Affected Software

25 affected componentsFixes available
Red Hat Red Hat OpenShift Container Platform for ARM 64
Red Hat Red Hat OpenShift Container Platform for IBM Z and LinuxONE
Red Hat Red Hat OpenShift Container Platform for Power
Red Hat Red Hat OpenShift Container Platform
redhat/microshift<4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
redhat/microshift<4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
redhat/microshift-ai-model-serving<4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
redhat/microshift-ai-model-serving-release-info<4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
redhat/microshift-gateway-api<4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
redhat/microshift-gateway-api-release-info<4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
redhat/microshift-greenboot<4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
redhat/microshift-low-latency<4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
redhat/microshift-multus<4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
redhat/microshift-multus-release-info<4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
redhat/microshift-networking<4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
redhat/microshift-observability<4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
redhat/microshift-olm<4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
redhat/microshift-olm-release-info<4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
redhat/microshift-release-info<4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
redhat/microshift-selinux<4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
redhat/microshift<4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9.aa
4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9.aa
redhat/microshift-gateway-api<4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9.aa
4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9.aa
redhat/microshift-multus<4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9.aa
4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9.aa
redhat/microshift-networking<4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9.aa
4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9.aa
redhat/microshift-olm<4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9.aa
4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9.aa

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/microshift to a version that resolves this vulnerability.

    Fixed in 4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
  2. Upgrade

    Upgrade redhat/microshift-ai-model-serving to a version that resolves this vulnerability.

    Fixed in 4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
  3. Upgrade

    Upgrade redhat/microshift-ai-model-serving-release-info to a version that resolves this vulnerability.

    Fixed in 4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
  4. Upgrade

    Upgrade redhat/microshift-gateway-api to a version that resolves this vulnerability.

    Fixed in 4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
  5. Upgrade

    Upgrade redhat/microshift-gateway-api-release-info to a version that resolves this vulnerability.

    Fixed in 4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
  6. Upgrade

    Upgrade redhat/microshift-greenboot to a version that resolves this vulnerability.

    Fixed in 4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
  7. Upgrade

    Upgrade redhat/microshift-low-latency to a version that resolves this vulnerability.

    Fixed in 4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
  8. Upgrade

    Upgrade redhat/microshift-multus to a version that resolves this vulnerability.

    Fixed in 4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
  9. Upgrade

    Upgrade redhat/microshift-multus-release-info to a version that resolves this vulnerability.

    Fixed in 4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
  10. Upgrade

    Upgrade redhat/microshift-networking to a version that resolves this vulnerability.

    Fixed in 4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
  11. Upgrade

    Upgrade redhat/microshift-observability to a version that resolves this vulnerability.

    Fixed in 4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
  12. Upgrade

    Upgrade redhat/microshift-olm to a version that resolves this vulnerability.

    Fixed in 4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
  13. Upgrade

    Upgrade redhat/microshift-olm-release-info to a version that resolves this vulnerability.

    Fixed in 4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
  14. Upgrade

    Upgrade redhat/microshift-release-info to a version that resolves this vulnerability.

    Fixed in 4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
  15. Upgrade

    Upgrade redhat/microshift-selinux to a version that resolves this vulnerability.

    Fixed in 4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9
  16. Upgrade

    Upgrade redhat/microshift to a version that resolves this vulnerability.

    Fixed in 4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9.aa
  17. Upgrade

    Upgrade redhat/microshift-gateway-api to a version that resolves this vulnerability.

    Fixed in 4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9.aa
  18. Upgrade

    Upgrade redhat/microshift-multus to a version that resolves this vulnerability.

    Fixed in 4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9.aa
  19. Upgrade

    Upgrade redhat/microshift-networking to a version that resolves this vulnerability.

    Fixed in 4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9.aa
  20. Upgrade

    Upgrade redhat/microshift-olm to a version that resolves this vulnerability.

    Fixed in 4.19.43-202608141837.p0.gcd3decf.assembly.4.19.43.el9.aa
  21. Upgrade

    Upgrade MicroShift 4.19 to a version that resolves this vulnerability.

    Fixed in 4.19.43Patch RHSA-2026:54555
  22. Compensating control

    After applying the RHSA-2026:54555 update for MicroShift 4.19.43, ensure you are using the updated container images provided in the advisory (for Go net/mail DoS via crafted email inputs, CVE-2026-39820) from the available RPM repository/errata contents.

Event History

Aug 19, 2026
Advisory Published
via Red Hat·12:00 AM
Data Sourced
via Red Hat·12:00 AM
RemedyDescriptionAffected Software
Advisory Published
via Red Hat·01:21 PM
Data Sourced
via Red Hat·01:21 PM
Severity

Frequently Asked Questions

1

Which deployments should be prioritized for this update?

Deployments running Red Hat build of MicroShift 4.19 should be prioritized. The advisory recommends updating the RPM packages and associated images when they become available in the RPM repository.

2

What condition is required to trigger the reported vulnerability?

The documented issue is a denial of service in Go's net/mail component caused by crafted email inputs. The advisory does not provide further details about the affected MicroShift component, exposure path, or required attacker access.

3

What should be updated besides the RPM packages?

The advisory states that container images for this release are covered by a separate advisory, RHSA-2026:54555. Update both the available MicroShift RPM packages and the corresponding release images.

Company

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