RHCOS 4 : Red Hat build of MicroShift 4.18.42 (RHSA-2026:18068)

critical Nessus Plugin ID 315921

Synopsis

The remote Red Hat CoreOS host is missing a security update for Red Hat build of MicroShift 4.18.42.

Description

The remote Red Hat Enterprise Linux CoreOS 4 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:18068 advisory.

- 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)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the RHCOS Red Hat build of MicroShift 4.18.42 package based on the guidance in RHSA-2026:18068.

Plugin Details

Severity: Critical

ID: 315921

File Name: rhcos-RHSA-2026-18068.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Red Hat Local Security Checks

Published: 5/20/2026

Updated: 5/20/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.0

Vendor

Vendor Severity: Important

CVSS v2

Risk Factor: High

Base Score: 9.4

Temporal Score: 7.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:N

CVSS Score Source: CVE-2026-33186

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Temporal Score: 8.2

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:redhat:enterprise_linux:9:coreos, p-cpe:/a:redhat:enterprise_linux:microshift, p-cpe:/a:redhat:enterprise_linux:microshift-networking, p-cpe:/a:redhat:enterprise_linux:microshift-release-info, p-cpe:/a:redhat:enterprise_linux:microshift-selinux, p-cpe:/a:redhat:enterprise_linux:microshift-greenboot, p-cpe:/a:redhat:enterprise_linux:microshift-olm, p-cpe:/a:redhat:enterprise_linux:microshift-olm-release-info, p-cpe:/a:redhat:enterprise_linux:microshift-multus, p-cpe:/a:redhat:enterprise_linux:microshift-multus-release-info, p-cpe:/a:redhat:enterprise_linux:microshift-low-latency, p-cpe:/a:redhat:enterprise_linux:microshift-gateway-api, p-cpe:/a:redhat:enterprise_linux:microshift-gateway-api-release-info

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 5/20/2026

Vulnerability Publication Date: 3/18/2026

Reference Information

CVE: CVE-2026-33186

CWE: 551

RHSA: 2026:18068

Detections

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