RHCOS 4 : Red Hat build of MicroShift 4.22.16 (RHSA-2026:71672)

medium Nessus Plugin ID 351132

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Synopsis

The remote Red Hat CoreOS host is missing one or more security updates for Red Hat build of MicroShift 4.22.16.

Description

The remote Red Hat Enterprise Linux CoreOS 4 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:71672 advisory.

- encoding/asn1: golang: Go encoding/asn1: Denial of Service via excessive recursion in Unmarshal (CVE-2026-33818)

- net/http: golang: Go net/http: Unencrypted HTTP/2 connections vulnerable to Denial of Service (CVE-2026-56853)

- html/template: golang: Go html/template: Cross-Site Scripting via pathological input (CVE-2026-56858)

- net/url: golang: golang net/url: Denial of Service from quadratic complexity in path resolution (CVE-2026-56860)

- crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages (CVE-2026-56862)

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

Solution

Update the RHCOS Red Hat build of MicroShift 4.22.16 package based on the guidance in RHSA-2026:71672.

Plugin Details

Severity: Medium

ID: 351132

File Name: rhcos-RHSA-2026-71672.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Red Hat Local Security Checks

Published: 9/29/2026

Updated: 9/29/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 93.28

Vendor

Vendor Severity: Important

CVSS v2

Risk Factor: High

Base Score: 9.4

Temporal Score: 7

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

CVSS Score Source: CVE-2026-56858

CVSS v3

Risk Factor: Medium

Base Score: 6.1

Temporal Score: 5.3

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

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

Vulnerability Information

CPE: cpe:/o:redhat:enterprise_linux:9:coreos, p-cpe:/a:redhat:enterprise_linux:microshift-ai-model-serving-release-info, p-cpe:/a:redhat:enterprise_linux:microshift-ai-model-serving, p-cpe:/a:redhat:enterprise_linux:microshift-cert-manager-release-info, p-cpe:/a:redhat:enterprise_linux:microshift-cert-manager, p-cpe:/a:redhat:enterprise_linux:microshift-gateway-api-release-info, p-cpe:/a:redhat:enterprise_linux:microshift-gateway-api, p-cpe:/a:redhat:enterprise_linux:microshift-greenboot, p-cpe:/a:redhat:enterprise_linux:microshift-low-latency, p-cpe:/a:redhat:enterprise_linux:microshift-multus-release-info, p-cpe:/a:redhat:enterprise_linux:microshift-multus, p-cpe:/a:redhat:enterprise_linux:microshift-networking, p-cpe:/a:redhat:enterprise_linux:microshift-observability, p-cpe:/a:redhat:enterprise_linux:microshift-olm-release-info, p-cpe:/a:redhat:enterprise_linux:microshift-olm, p-cpe:/a:redhat:enterprise_linux:microshift-release-info, p-cpe:/a:redhat:enterprise_linux:microshift-selinux, p-cpe:/a:redhat:enterprise_linux:microshift-sriov-release-info, p-cpe:/a:redhat:enterprise_linux:microshift-sriov, p-cpe:/a:redhat:enterprise_linux:microshift

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

Exploit Ease: No known exploits are available

Patch Publication Date: 9/29/2026

Vulnerability Publication Date: 8/13/2026

Reference Information

CVE: CVE-2026-33818, CVE-2026-56853, CVE-2026-56858, CVE-2026-56860, CVE-2026-56862

CWE: 1050, 770, 776, 79

RHSA: 2026:71672

Detections

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