RHSA-2026:80167HighCVSS 8.1

Red Hat Security Advisory: Red Hat build of MicroShift 4.18.57 security update

Published
October 15, 2026
Last Modified
October 21, 2026

🔗 CVE IDs covered (6)

CVE-2026-42504 →CVE-2026-56858 →CVE-2026-56860 →CVE-2026-56862 →CVE-2026-33814 →CVE-2026-33818 →

📋 Description

CVE-2026-33814 — net/http/internal/http2: golang: golang.org/x/net: Go HTTP/2: Denial of Service via malformed SETTINGS_MAX_FRAME_SIZE frame CVE-2026-33818 — encoding/asn1: golang: Go encoding/asn1: Denial of Service via excessive recursion in Unmarshal CVE-2026-42504 — mime: golang: Golang MIME: Denial of Service via maliciously-crafted MIME header CVE-2026-56858 — html/template: golang: Go html/template: Cross-Site Scripting via pathological input CVE-2026-56860 — net/url: golang: golang net/url: Denial of Service from quadratic complexity in path resolution CVE-2026-56862 — crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages

🎯 Affected products19

  • Red Hat OpenShift Container Platform 4.18
  • microshift-0:4.18.57-202610092321.p0.g94a47d0.assembly.4.18.57.el9.aarch64 as a component of Red Hat OpenShift Container Platform 4.18
  • microshift-0:4.18.57-202610092321.p0.g94a47d0.assembly.4.18.57.el9.src as a component of Red Hat OpenShift Container Platform 4.18
  • microshift-0:4.18.57-202610092321.p0.g94a47d0.assembly.4.18.57.el9.x86_64 as a component of Red Hat OpenShift Container Platform 4.18
  • microshift-gateway-api-0:4.18.57-202610092321.p0.g94a47d0.assembly.4.18.57.el9.aarch64 as a component of Red Hat OpenShift Container Platform 4.18
  • microshift-gateway-api-0:4.18.57-202610092321.p0.g94a47d0.assembly.4.18.57.el9.x86_64 as a component of Red Hat OpenShift Container Platform 4.18
  • microshift-gateway-api-release-info-0:4.18.57-202610092321.p0.g94a47d0.assembly.4.18.57.el9.noarch as a component of Red Hat OpenShift Container Platform 4.18
  • microshift-greenboot-0:4.18.57-202610092321.p0.g94a47d0.assembly.4.18.57.el9.noarch as a component of Red Hat OpenShift Container Platform 4.18
  • microshift-low-latency-0:4.18.57-202610092321.p0.g94a47d0.assembly.4.18.57.el9.noarch as a component of Red Hat OpenShift Container Platform 4.18
  • microshift-multus-0:4.18.57-202610092321.p0.g94a47d0.assembly.4.18.57.el9.aarch64 as a component of Red Hat OpenShift Container Platform 4.18
  • microshift-multus-0:4.18.57-202610092321.p0.g94a47d0.assembly.4.18.57.el9.x86_64 as a component of Red Hat OpenShift Container Platform 4.18
  • microshift-multus-release-info-0:4.18.57-202610092321.p0.g94a47d0.assembly.4.18.57.el9.noarch as a component of Red Hat OpenShift Container Platform 4.18
  • microshift-networking-0:4.18.57-202610092321.p0.g94a47d0.assembly.4.18.57.el9.aarch64 as a component of Red Hat OpenShift Container Platform 4.18
  • microshift-networking-0:4.18.57-202610092321.p0.g94a47d0.assembly.4.18.57.el9.x86_64 as a component of Red Hat OpenShift Container Platform 4.18
  • microshift-olm-0:4.18.57-202610092321.p0.g94a47d0.assembly.4.18.57.el9.aarch64 as a component of Red Hat OpenShift Container Platform 4.18
  • microshift-olm-0:4.18.57-202610092321.p0.g94a47d0.assembly.4.18.57.el9.x86_64 as a component of Red Hat OpenShift Container Platform 4.18
  • microshift-olm-release-info-0:4.18.57-202610092321.p0.g94a47d0.assembly.4.18.57.el9.noarch as a component of Red Hat OpenShift Container Platform 4.18
  • microshift-release-info-0:4.18.57-202610092321.p0.g94a47d0.assembly.4.18.57.el9.noarch as a component of Red Hat OpenShift Container Platform 4.18
  • microshift-selinux-0:4.18.57-202610092321.p0.g94a47d0.assembly.4.18.57.el9.noarch as a component of Red Hat OpenShift Container Platform 4.18

✅ Remediation

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 Workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. Workaround: To mitigate this issue, restrict network access to services that process MIME headers from untrusted sources. Implement input validation and sanitization for all incoming data, especially MIME headers, to prevent maliciously crafted content from being processed by applications utilizing the vulnerable Golang MIME package.

🔗 References (9)