Detections
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RHCOS 4 : OpenShift Container Platform 4.18.54 (RHSA-2026:57482)

high Nessus Plugin ID 340162

Synopsis

The remote Red Hat CoreOS host is missing one or more security updates for OpenShift Container Platform 4.18.54.

Description

The remote Red Hat Enterprise Linux CoreOS 4 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:57482 advisory.

 - net/url: Incorrect parsing of IPv6 host literals in net/url (CVE-2026-25679)

 - crypto/x509: golang: golang crypto/x509: Denial of Service via excessive processing of DNS SAN entries (CVE-2026-27145)

 - crypto/x509: crypto/tls: golang: Go: Denial of Service vulnerability in certificate chain building (CVE-2026-32280)

 - net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME (CVE-2026-33811)

 - net/mail: golang: Go net/mail: Denial of Service via crafted email inputs (CVE-2026-39820)

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 OpenShift Container Platform 4.18.54 packages based on the guidance in RHSA-2026:57482.

See Also

https://access.redhat.com/errata/RHSA-2026:57482

https://access.redhat.com/security/updates/classification/#important

https://bugzilla.redhat.com/show_bug.cgi?id=2445356

https://bugzilla.redhat.com/show_bug.cgi?id=2456339

https://bugzilla.redhat.com/show_bug.cgi?id=2467809

https://bugzilla.redhat.com/show_bug.cgi?id=2467820

https://bugzilla.redhat.com/show_bug.cgi?id=2467822

https://bugzilla.redhat.com/show_bug.cgi?id=2484204

https://bugzilla.redhat.com/show_bug.cgi?id=2484207

http://www.nessus.org/u?201c399c

Plugin Details

Severity: High

ID: 340162

File Name: rhcos-RHSA-2026-57482.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 8/26/2026

Updated: 8/26/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 93.89

Vendor

Vendor Severity: Important

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2026-39820

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

Vulnerability Information

CPE: cpe:/o:redhat:enterprise_linux:8:coreos, cpe:/o:redhat:enterprise_linux:9:coreos, p-cpe:/a:redhat:enterprise_linux:butane-redistributable, p-cpe:/a:redhat:enterprise_linux:butane, p-cpe:/a:redhat:enterprise_linux:cri-o, p-cpe:/a:redhat:enterprise_linux:cri-tools, p-cpe:/a:redhat:enterprise_linux:ignition-validate, p-cpe:/a:redhat:enterprise_linux:ignition, p-cpe:/a:redhat:enterprise_linux:openshift-clients-redistributable, p-cpe:/a:redhat:enterprise_linux:openshift-clients, p-cpe:/a:redhat:enterprise_linux:openshift-hyperkube, p-cpe:/a:redhat:enterprise_linux:openshift-kube-apiserver, p-cpe:/a:redhat:enterprise_linux:openshift-kube-controller-manager, p-cpe:/a:redhat:enterprise_linux:openshift-kube-scheduler, p-cpe:/a:redhat:enterprise_linux:openshift-kubelet, p-cpe:/a:redhat:enterprise_linux:openshift, p-cpe:/a:redhat:enterprise_linux:ose-aws-ecr-image-credential-provider, p-cpe:/a:redhat:enterprise_linux:ose-azure-acr-image-credential-provider, p-cpe:/a:redhat:enterprise_linux:ose-gcp-gcr-image-credential-provider

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: 8/26/2026

Vulnerability Publication Date: 3/5/2026

Reference Information

CVE: CVE-2026-25679, CVE-2026-27145, CVE-2026-32280, CVE-2026-33811, CVE-2026-39820, CVE-2026-42499, CVE-2026-42504