Issued:
2026-05-20
Updated:
2026-05-20

RHSA-2026:18068 - Important: Red Hat build of MicroShift 4.18.42 security update

Synopsis

Important: Red Hat build of MicroShift 4.18.42 security update

Type/Severity

Security Advisory Important

Topic

Red Hat build of MicroShift release 4.18.42 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.

Description

Red Hat build of MicroShift is Red Hat's light-weight Kubernetes orchestration solution designed for edge device deployments and is built from the edge capabilities of Red Hat OpenShift Container Platform. MicroShift is an application that is deployed on top of Red Hat Enterprise Linux devices at the edge, providing an efficient way to operate single-node clusters in these low-resource environments.

This advisory contains the RPM packages for Red Hat build of MicroShift 4.18.42. Read the following advisory for the container images for this release:

https://access.redhat.com/errata/RHSA-2026:17448

Security Fix(es):

  • google.golang.org/grpc/grpc-go: google.golang.org/grpc/authz: gRPC-Go: Authorization bypass due to improper HTTP/2 path validation (CVE-2026-33186)

All Red Hat build of MicroShift 4.18 users are advised to use these updated packages and images when they are available in the RPM repository.

Solution

For MicroShift 4.18, read the following documentation for important instructions on how to install the latest RPMs and fully apply this asynchronous errata update:

https://docs.redhat.com/en/documentation/red_hat_build_of_microshift/4.18/html/red_hat_build_of_microshift_release_notes/index

Affected Products

ProductVersionArch
Red Hat OpenShift Container Platform4.18x86_64
Red Hat OpenShift Container Platform for Power4.18ppc64le
Red Hat OpenShift Container Platform for IBM Z and LinuxONE4.18s390x
Red Hat OpenShift Container Platform for ARM 644.18aarch64

Updated Packages

  • microshift-networking-4.18.42-202605181217.p0.gf4eeb37.assembly.4.18.42.el9.x86_64.rpm
  • microshift-gateway-api-release-info-4.18.42-202605181217.p0.gf4eeb37.assembly.4.18.42.el9.noarch.rpm
  • microshift-release-info-4.18.42-202605181217.p0.gf4eeb37.assembly.4.18.42.el9.noarch.rpm
  • microshift-olm-4.18.42-202605181217.p0.gf4eeb37.assembly.4.18.42.el9.x86_64.rpm
  • microshift-networking-4.18.42-202605181217.p0.gf4eeb37.assembly.4.18.42.el9.aarch64.rpm
  • microshift-gateway-api-4.18.42-202605181217.p0.gf4eeb37.assembly.4.18.42.el9.x86_64.rpm
  • microshift-4.18.42-202605181217.p0.gf4eeb37.assembly.4.18.42.el9.src.rpm
  • microshift-multus-release-info-4.18.42-202605181217.p0.gf4eeb37.assembly.4.18.42.el9.noarch.rpm
  • microshift-4.18.42-202605181217.p0.gf4eeb37.assembly.4.18.42.el9.x86_64.rpm
  • microshift-selinux-4.18.42-202605181217.p0.gf4eeb37.assembly.4.18.42.el9.noarch.rpm
  • microshift-4.18.42-202605181217.p0.gf4eeb37.assembly.4.18.42.el9.aarch64.rpm
  • microshift-olm-release-info-4.18.42-202605181217.p0.gf4eeb37.assembly.4.18.42.el9.noarch.rpm
  • microshift-low-latency-4.18.42-202605181217.p0.gf4eeb37.assembly.4.18.42.el9.noarch.rpm
  • microshift-gateway-api-4.18.42-202605181217.p0.gf4eeb37.assembly.4.18.42.el9.aarch64.rpm
  • microshift-multus-4.18.42-202605181217.p0.gf4eeb37.assembly.4.18.42.el9.aarch64.rpm
  • microshift-olm-4.18.42-202605181217.p0.gf4eeb37.assembly.4.18.42.el9.aarch64.rpm
  • microshift-greenboot-4.18.42-202605181217.p0.gf4eeb37.assembly.4.18.42.el9.noarch.rpm
  • microshift-multus-4.18.42-202605181217.p0.gf4eeb37.assembly.4.18.42.el9.x86_64.rpm

Fixes

CVEs

References

Additional information